Add GitHub Action sample

Author: DanielJette

.github/workflows/flix_sample.yml

@@ -0,0 +1,102 @@
+name: "Flix Sample Screenshot Tests"
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/flix_sample.yml"
+      - "Samples/Flix/**"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+
+  build:
+    name: "Build APKs for testing"
+    timeout-minutes: 25
+    runs-on:
+      labels: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: "temurin"
+          java-version: 21
+
+      - name: Build
+        run: |
+          echo "Building ..."
+          ./gradlew FlixSample:assembleDebug
+          ./gradlew FlixSample:assembleDebugAndroidTest
+
+      - name: Upload app apk
+        uses: actions/upload-artifact@v4
+        with:
+          name: android-app
+          path: ./Samples/Flix/build/outputs/apk/debug/FlixSample-debug.apk
+
+      - name: Upload test runner apk
+        uses: actions/upload-artifact@v4
+        with:
+          name: android-test-app
+          path: ./Samples/Flix/build/outputs/apk/androidTest/debug/FlixSample-debug-androidTest.apk
+
+  screenshot_test:
+    name: Run Screenshot Tests ${{ matrix.shard_index }}
+    timeout-minutes: 25
+    needs: build
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        shard_index: [0, 1]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: "temurin"
+          java-version: 21
+
+      - name: Download app apk
+        uses: actions/download-artifact@v4
+        with:
+          name: android-app
+          path: ./Samples/Flix/build/outputs/apk/debug/
+
+      - name: Determine apk path
+        run: |
+          echo "app_apk=$(find ./Samples/Flix/build/outputs/apk/debug/*.apk)" >> $GITHUB_ENV
+
+      - name: Download test runner apk
+        uses: actions/download-artifact@v4
+        with:
+          name: android-test-app
+          path: ./Samples/Flix/build/outputs/apk/androidTest/debug/
+
+      - name: Determine test apk path
+        run: |
+          echo "test_apk=$(find ./Samples/Flix/build/outputs/apk/androidTest/debug/*.apk)" >> $GITHUB_ENV
+
+      - name: Screenshot Tests
+        uses: ndtp/android-testify-action@v1
+        with:
+          api-level: 29
+          target: google_apis
+          arch: x86_64
+          profile: pixel_3a
+          shard_count: 2
+          shard_index: ${{ matrix.shard_index }}
+          module: ":FlixSample"
+          app_apk: ${{ env.app_apk }}
+          app_package: "dev.testify.samples.flix"
+          test_apk: ${{ env.test_apk }}
+          test_package: "dev.testify.samples.flix.test"
+          test_runner: "androidx.test.runner.AndroidJUnitRunner"
+          verbose: true