Add Github Actions

.github/workflows/build-main.yml

@@ -0,0 +1,30 @@
+name: Build Android app
+on:
+  push:
+    branches:
+      - 'main'
+  pull_request:
+    branches:
+      - 'master'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v3
+        with:
+          java-version: '21'
+          distribution: 'zulu'
+          cache: 'gradle'
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+        with:
+          packages: '' # no extra packages needed
+
+      - name: Build APK
+        run: ./gradlew --no-daemon packageDebug

.github/workflows/build-release.yml

@@ -0,0 +1,49 @@
+name: Release Android app
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v3
+        with:
+          java-version: '21'
+          distribution: 'zulu'
+          cache: 'gradle'
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+        with:
+          packages: '' # no extra packages needed
+
+      - name: Install Android platform tools
+        run: sdkmanager platform-tools
+
+      - name: Build APK
+        run: ./gradlew --no-daemon packageRelease
+
+      - name: Sign APK
+        uses: r0adkll/sign-android-release@v1
+        id: sign_apk
+        with:
+          releaseDirectory: app/build/outputs/apk/release
+          signingKeyBase64: ${{ secrets.KEYSTORE_DATA }}
+          alias: questionmark
+          keyStorePassword: ${{ secrets.KEYSTORE_PASSWORD }}
+          keyPassword: ${{ secrets.KEYSTORE_PASSWORD }}
+
+      - name: Rename APK
+        run: mv ${{ steps.sign_apk.outputs.signedReleaseFile }} org.thequestionmark.questionmark.apk
+
+      - name: Create Github Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: org.thequestionmark.questionmark.apk
+

README.md

@@ -29,7 +29,7 @@ From the command-line, you need a [Java Development Kit](https://openjdk.org/).
 You may need the Android command-line tools as well. To produce a debug build, run:
 
 ```
-./gradlew assembleDebug
+./gradlew packageDebug
 ```
 
 to find an APK in `app/build/outputs/apk/debug/app-debug.apk`
@@ -39,7 +39,7 @@ to find an APK in `app/build/outputs/apk/debug/app-debug.apk`
 A Github Action is used to build a release version when a new version is tagged, the resulting
 APK is attached to the Github release, which you can upload to the Google Play Console.
 
-To build a release version locally, run `./gradlew assembleRelease` but you may need to do something with keystores.
+To build a release version locally, run `./gradlew packageRelease` but you may need to do something with keystores.
 
 ## Barcode scanner