chore: github actions

.github/actions/prepare/action.yml

@@ -0,0 +1,17 @@
+name: Prepare
+
+description: Checkout and install dependencies
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/setup-node@v3
+      with:
+        node-version: '18.x'
+        registry-url: 'https://registry.npmjs.org'
+    - name: Install npm
+      shell: bash
+      run: npm install -g npm
+    - name: Install dependencies
+      shell: bash
+      run: npm ci

.github/workflows/checks.yml

@@ -0,0 +1,45 @@
+name: Checks
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Prepare
+        uses: ./.github/actions/prepare
+      - name: Build
+        run: npm run build --workspaces
+
+  format:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Prepare
+        uses: ./.github/actions/prepare
+      - name: Lint
+        run: npm run format:check
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Prepare
+        uses: ./.github/actions/prepare
+      - name: Lint
+        run: npm run lint
+
+  may-merge:
+    needs: ['format', 'lint', 'build']
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cleared for merging
+        run: echo OK