Add support for setting a custom working-directory.

.github/workflows/workflow.yml

@@ -28,9 +28,6 @@ jobs:
         npm run lint
         npm test
 
-    - name: Prepare test fixture
-      run: cp -a ./test-fixture/* ./
-
     - name: Java 13
       uses: actions/setup-java@v1
       with:
@@ -45,6 +42,7 @@ jobs:
         profile: Nexus 6
         emulator-options: -no-window -gpu swiftshader_indirect -no-snapshot -noaudio -no-boot-anim -camera-back none
         disable-animations: true
+        working-directory: ./test-fixture/
         script: |
           echo $GITHUB_REPOSITORY
           ./gradlew help