Add CI workflow

.github/workflows/main.yml

@@ -0,0 +1,29 @@
+name: Build
+
+on:
+  pull_request:
+    branches:
+      - main
+      - starter
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set Up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu' # See 'Supported distributions' for available options
+          java-version: '17'
+          cache: 'gradle'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Build project and run local and device tests
+        run: ./gradlew :app:assembleDebug