ci: GitHub actions workflow (#8)

* chore: Create GitHub actions workflow to upload debug APK on commit

* build: Log test results while running tests with gradlew

* ci: update jdk version used, only test debug build

* ci: use correct order of execution of tasks (build, test, deploy)

.github/workflows/android.yml

@@ -0,0 +1,31 @@
+name: Android CI
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          cache: gradle
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build debug APK with Gradle
+        run: ./gradlew assembleDebug
+
+      - name: Run tests
+        run: ./gradlew testDebugUnitTest
+
+      - name: Upload debug APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: tomato-debug
+          path: ./app/build/outputs/apk/debug/app-debug.apk