Migrate to gradle-build-action.

.github/workflows/main.yml

@@ -64,12 +64,6 @@ jobs:
       uses: actions/setup-java@v1
       with:
         java-version: 15
-    - uses: actions/cache@v2
-      with:
-        path: |
-          ~/.gradle/caches
-          ~/.gradle/wrapper
-        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*') }}-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
     - uses: actions/cache@v2
       id: avd-cache
       with:
@@ -80,9 +74,10 @@ jobs:
         key: avd-${{ matrix.api-level }}-${{ matrix.os }}-${{ matrix.target }}
 
     - name: assemble tests
-      run: |
-        cd ./test-fixture/
-        ./gradlew assembleAndroidTest
+      uses: gradle/gradle-build-action@v2
+      with:
+        build-root-directory: test-fixture
+        arguments: assembleAndroidTest
 
     - name: run emulator to generate snapshot for caching
       if: steps.avd-cache.outputs.cache-hit != 'true'