CI: Test the standalone runner nightly

.github/workflows/standalone.yml

@@ -0,0 +1,74 @@
+# Workflow to run tests
+
+name: standalone compiler runner
+
+on:
+  # runs on 2:00 AM PST or 3:00 AM PDT
+  schedule:
+    - cron:  '0 10 * * *'
+
+jobs:
+  build-and-test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        branch: [ main, 1.0.7-release ]
+
+    # The type of runner that the job will run on
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Setup Java 9
+      uses: actions/setup-java@v1.4.3
+      with:
+        java-version: '9'
+        java-package: jdk
+        architecture: x64
+    - name: set JDK_9 environment variable for kotlin compiler
+      shell: bash
+      env:
+        ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+      run: echo ::set-env name=JDK_9::$(echo $JAVA_HOME)
+    - name: Setup Java 11
+      uses: actions/setup-java@v1.4.3
+      with:
+        java-version: '11'
+        java-package: jdk
+        architecture: x64
+
+    # Checkout
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+        ref: ${{ matrix.branch }}
+
+    # Build cache
+    - name: Cache Gradle Cache
+      uses: actions/cache@v2
+      with:
+        path: ~/.gradle/caches
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}-${{ hashFiles('**/gradle.properties') }}
+        # An ordered list of keys to use for restoring the cache if no cache hit occurred for key
+        restore-keys: |
+          ${{ runner.os }}-gradle-
+    - name: Cache gradle wrapper
+      uses: actions/cache@v2
+      with:
+        path: ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('gradle/wrapper/gradle-wrapper.properties') }}
+
+    # Run tests
+    - name: test
+      shell: bash
+      run: ./gradlew -Pksp.compiler.runner=standalone --stacktrace --info :integration-tests:test :gradle-plugin:test
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v3
+      with:
+        name: test-reports-standalone-${{ matrix.os }}-${{ matrix.branch }}
+        path: |
+          compiler-plugin/build/reports
+          integration-tests/build/reports
+          gradle-plugin/build/reports
+          common-util/build/reports