Combine all integTest workflows into 2 workflow runs

- Workflow to run all integTest workflows, allowing use of prior cache entries
- Workflow that starts with empty cache

Both of these use workflow_call to combine the existing workflows.

.github/workflows/integ-test-restore-configuration-cache.yml

@@ -0,0 +1,138 @@
+name: Test save/restore configuration-cache state
+
+on:
+  workflow_call:
+    inputs:
+      cache-key-prefix:
+        type: string
+  workflow_dispatch:
+
+env:
+  GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: restore-configuration-cache-${{ inputs.cache-key-prefix }}
+  GRADLE_BUILD_ACTION_CACHE_DEBUG_ENABLED: true
+
+jobs:
+  seed-build-groovy:
+    env:
+      GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: ${{ inputs.cache-key-prefix }}-groovy-
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle
+      uses: ./
+    - name: Groovy build with configuration-cache enabled
+      working-directory: .github/workflow-samples/groovy-dsl
+      run: ./gradlew test --configuration-cache
+
+  verify-build-groovy:
+    env:
+      GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: ${{ inputs.cache-key-prefix }}-groovy-
+    needs: seed-build-groovy
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle
+      uses: ./
+      with:
+        cache-read-only: true
+    - name: Groovy build with configuration-cache enabled
+      id: execute
+      working-directory: .github/workflow-samples/groovy-dsl
+      run: ./gradlew test --configuration-cache
+    - name: Check that configuration-cache was used
+      if: ${{ steps.execute.outputs.task_configured == 'yes' }}
+      uses: actions/github-script@v5
+      with:
+        script: |
+          core.setFailed('Configuration cache was not used - task was configured unexpectedly')
+
+  # Check that the build can run when no extracted cache entries are restored
+  gradle-user-home-not-fully-restored:
+    env:
+      GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: ${{ inputs.cache-key-prefix }}-groovy-
+    needs: seed-build-groovy
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle with no extracted cache entries restored
+      uses: ./
+      env: 
+        GRADLE_BUILD_ACTION_SKIP_RESTORE: "generated-gradle-jars|wrapper-zips|java-toolchains|instrumented-jars|dependencies|kotlin-dsl"
+      with:
+        cache-read-only: true
+    - name: Check execute Gradle build with configuration cache enabled (but not restored)
+      working-directory: .github/workflow-samples/groovy-dsl
+      run: ./gradlew test --configuration-cache
+
+  seed-build-kotlin:
+    env:
+      GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: ${{ inputs.cache-key-prefix }}-kotlin-
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle
+      uses: ./
+    - name: Execute 'help' with configuration-cache enabled
+      working-directory: .github/workflow-samples/kotlin-dsl
+      run: ./gradlew help --configuration-cache
+
+  modify-build-kotlin:
+    env:
+      GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: ${{ inputs.cache-key-prefix }}-kotlin-
+    needs: seed-build-kotlin
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle
+      uses: ./
+    - name: Execute 'test' with configuration-cache enabled
+      working-directory: .github/workflow-samples/kotlin-dsl
+      run: ./gradlew test --configuration-cache
+
+  # Test restore configuration-cache from the third build invocation
+  verify-build-kotlin:
+    env:
+      GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: ${{ inputs.cache-key-prefix }}-kotlin-
+    needs: modify-build-kotlin
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle
+      uses: ./
+      with:
+        cache-read-only: true
+    - name: Execute 'test' again with configuration-cache enabled
+      id: execute
+      working-directory: .github/workflow-samples/kotlin-dsl
+      run: ./gradlew test --configuration-cache
+    - name: Check that configuration-cache was used
+      if: ${{ steps.execute.outputs.task_configured == 'yes' }}
+      uses: actions/github-script@v5
+      with:
+        script: |
+          core.setFailed('Configuration cache was not used - task was configured unexpectedly')
+