finish fast if both builds were made from a cache

Author: 2bndy5

.github/workflows/perf-test.yml

@@ -32,6 +32,9 @@ jobs:
             name: current
           - commit: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}
             name: previous
+    outputs:
+      cached-previous: ${{ steps.is-cached-previous.outputs.is-cached }}
+      cached-current: ${{ steps.is-cached-current.outputs.is-cached }}
     steps:
       - name: Checkout ${{ matrix.name }}
         uses: actions/checkout@v4
@@ -41,8 +44,16 @@ jobs:
         uses: actions/cache@v4
         id: cache
         with:
-          key: bin-cache-${{ matrix.name }}-${{ matrix.commit }}
+          key: bin-cache-${{ hashFiles('cpp-linter/src/**', 'Cargo.toml', 'Cargo.lock', 'cpp-linter/Cargo.toml') }}
           path: target/release/cpp-linter
+      - name: Is previous cached?
+        if: matrix.name == 'previous'
+        id: is-cached-previous
+        run: echo "is-cached=${{ steps.cache.outputs.cache-hit }}" >> $GITHUB_OUTPUT
+      - name: Is current cached?
+        if: matrix.name == 'current'
+        id: is-cached-current
+        run: echo "is-cached=${{ steps.cache.outputs.cache-hit }}" >> $GITHUB_OUTPUT
       - run: rustup update --no-self-update
         if: steps.cache.outputs.cache-hit != 'true'
       - run: cargo build --bin cpp-linter --release
@@ -56,6 +67,7 @@ jobs:
   benchmark:
     name: Measure Performance Difference
     needs: [build]
+    if: ${{ needs.build.outputs.cached-current != 'true' || !needs.build.outputs.cached-previous != 'true' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4