Share a build cache between CI jobs.

Let's not do the work twice.

.github/workflows/build.yaml

@@ -18,6 +18,8 @@ jobs:
           rustup show
 
       - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "build" # share the cache across jobs
 
       - name: build
         run: |
@@ -36,3 +38,7 @@ jobs:
             git diff Cargo.lock
             exit 1
           fi
+
+      - name: clippy
+        run: |
+          cargo clippy --release --all-targets --all-features

.github/workflows/format.yaml

@@ -0,0 +1,22 @@
+name: format
+
+on:
+  push:
+
+jobs:
+  cargo-fmt:
+    name: check formatting with cargo fmt
+    runs-on: ubuntu-latest
+    env:
+      CARGO_NET_GIT_FETCH_WITH_CLI: "true"
+      RUSTFLAGS: "-D warnings" # fail on warnings
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install tools
+        run: |
+          rustup show
+
+      - name: check formatting
+        run: |
+          cargo fmt --all --check

.github/workflows/test.yaml

@@ -18,6 +18,8 @@ jobs:
           rustup show
 
       - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "build" # share the cache across jobs
 
       - name: run tests
-        run: cargo test
+        run: cargo test --release --all-targets --all-features