Cache dependencies on Github Actions

.github/workflows/LATEST_DEPENDENCY_VERSIONS.yml

@@ -9,7 +9,7 @@ jobs:
     name: Test without yarn.lock
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
       - name: install vyper

.github/workflows/e2e-ci.yml

@@ -33,10 +33,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-core-ci.yml

@@ -28,10 +28,11 @@ jobs:
     name: Test hardhat-core on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -46,10 +47,11 @@ jobs:
     name: Test hardhat-core on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -67,10 +69,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-ethers-ci.yml

@@ -30,10 +30,11 @@ jobs:
     name: Test hardhat-ethers on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -45,10 +46,11 @@ jobs:
     name: Test hardhat-ethers on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -63,10 +65,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-etherscan-ci.yml

@@ -30,10 +30,11 @@ jobs:
     name: Test hardhat-etherscan on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -45,10 +46,11 @@ jobs:
     name: Test hardhat-etherscan on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -63,10 +65,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-ganache-ci.yml

@@ -30,10 +30,11 @@ jobs:
     name: Test hardhat-ganache on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -45,10 +46,11 @@ jobs:
     name: Test hardhat-ganache on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -63,10 +65,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-network-forking-ci.yml

@@ -36,10 +36,11 @@ jobs:
     name: Test Hardhat Network's forking functionality
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Cache network requests

.github/workflows/hardhat-network-tracing-ci.yml

@@ -31,10 +31,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-shorthand-ci.yml

@@ -30,10 +30,11 @@ jobs:
     name: Test hardhat-shorthand on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -45,10 +46,11 @@ jobs:
     name: Test hardhat-shorthand on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -63,10 +65,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-solhint-ci.yml

@@ -30,10 +30,11 @@ jobs:
     name: Test hardhat-solhint on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -45,10 +46,11 @@ jobs:
     name: Test hardhat-solhint on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -63,10 +65,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-solpp-ci.yml

@@ -30,10 +30,11 @@ jobs:
     name: Test hardhat-solpp on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -48,10 +49,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build

.github/workflows/hardhat-truffle4-ci.yml

@@ -32,10 +32,11 @@ jobs:
     name: Test hardhat-truffle4 on Windows with Node 12
     runs-on: windows-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -47,10 +48,11 @@ jobs:
     name: Test hardhat-truffle4 on MacOS with Node 12
     runs-on: macos-latest
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build
@@ -65,10 +67,11 @@ jobs:
       matrix:
         node: [12, 14, 16]
     steps:
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
-      - uses: actions/checkout@v2
+          cache: yarn
       - name: Install
         run: yarn --frozen-lockfile
       - name: Build