use branch name in the cache key (#1049)

.github/workflows/maven.yaml

@@ -21,13 +21,31 @@ jobs:
         with:
           distribution: 'temurin'
           java-version: '17'
+
+      - name: Extract branch name
+        id: extract_branch
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_HEAD_REF})"
+
       - name: Cache local Maven repository
+        id: cache-maven-repo
         uses: actions/cache@v2
         with:
           path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          key: ${{ runner.os }}-maven-${{ steps.extract_branch.outputs.branch }}-${{ hashFiles('**/pom.xml') }}
           restore-keys: |
-            ${{ runner.os }}-maven-
+            ${{ runner.os }}-maven-${{ steps.extract_branch.outputs.branch }}-${{ hashFiles('**/pom.xml') }}
+
+      - if: ${{ steps.cache-maven-repo.outputs.cache-hit == 'false' }}
+        name: cache miss callback
+        continue-on-error: false
+        run: echo 'cache miss'
+
+      - if: ${{ steps.cache-maven-repo.outputs.cache-hit == 'true' }}
+        name: cache hit callback
+        continue-on-error: false
+        run: echo 'cache hit'
+
       - name: Build with Maven
         run: ./mvnw -s .settings.xml clean org.jacoco:jacoco-maven-plugin:prepare-agent install -U -P sonar -nsu --batch-mode -Dmaven.test.redirectTestOutputToFile=true -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -Dmaven.wagon.http.pool=false -Dmaven.wagon.httpconnectionManager.ttlSeconds=120
       - name: Publish Test Report