Build once and reuse the target directory

.github/workflows/rust.yml

@@ -27,9 +27,37 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build_and_test:
+  build:
+    name: Rust build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Cache dependencies installed with cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ./target/deps
+            ~/.cargo
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-cargo-
+      - name: Build binary
+        run: |
+          # the binary will be used by the cargo test
+          cargo build --all-targets --all-features
+          cargo test --no-run --all-targets --all-features
+      - name: Compress before uploading artifact to preserve permissions # https://github.com/actions/upload-artifact/tree/v4.4.3#permission-loss
+        run: tar -cvzf target.tgz target/
+      - uses: actions/upload-artifact@v4
+        with:
+          include-hidden-files: true
+          name: target
+          path: target.tgz
+          retention-days: 1
+  test:
     name: Rust tests
     runs-on: ubuntu-latest
+    needs: build
     strategy:
       fail-fast: false
       matrix:
@@ -68,9 +96,11 @@ jobs:
             ~/.cargo
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: ${{ runner.os }}-cargo-
-      - name: Build binary
-        # the binary will be used by the next cargo test step
-        run: cargo build
+      - uses: actions/download-artifact@v4
+        with:
+          name: target
+          path: artifact
+      - run: tar -xvzf artifact/target.tgz && rm artifact/target.tgz
       - name: Run cargo tests
         env:
           AMBER_TEST_STRATEGY: docker