feat(ci-cd): Build and upload app on publish events

.github/actions/prepare-keystore/action.yml

@@ -0,0 +1,34 @@
+name: Prepare KeyStore
+description: Write the KeyStore file and properties to disk
+
+inputs:
+  signingStorePassword:
+    description: 'The password for the KeyStore'
+    required: true
+  signingKeyPassword:
+    description: 'The password for the Key'
+    required: true
+  signingKeyAlias:
+    description: 'The alias for the Key'
+    required: true
+  keyStoreBase64:
+    description: 'The KeyStore file encoded as base64'
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Write Keystore file 🗄️
+      id: android_keystore
+      uses: timheuer/base64-to-file@v1.0.3
+      with:
+        fileName: key.jks
+        encodedString: ${{ inputs.keyStoreBase64 }}
+
+    - name: Write Keystore properties 🗝️
+      shell: bash
+      run: |
+        echo "storeFile=${{ steps.android_keystore.outputs.filePath }}" > key.properties
+        echo "storePassword=${{ inputs.signingStorePassword }}" >> key.properties
+        echo "keyPassword=${{ inputs.signingKeyPassword }}" >> key.properties
+        echo "keyAlias=${{ inputs.signingKeyAlias }}" >> key.properties

.github/workflows/release-app-github.yaml

@@ -0,0 +1,52 @@
+name: Build and publish app
+
+on:
+  release:
+    types: [ published ]
+
+jobs:
+  release-app-github:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: gradle/wrapper-validation-action@v2
+
+      - name: Write KeyStore 🗝️
+        uses: ./.github/actions/prepare-keystore
+        with:
+          signingStorePassword: ${{ secrets.SIGNING_STORE_PASSWORD }}
+          signingKeyPassword: ${{ secrets.SIGNING_KEY_PASSWORD }}
+          signingKeyAlias: ${{ secrets.SIGNING_KEY_ALIAS }}
+          keyStoreBase64: ${{ secrets.KEYSTORE }}
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'adopt'
+          java-version: 21
+          cache: 'gradle'
+
+      - name: Build APKs 📱
+        run: ./gradlew assembleRelease
+
+      - name: Build AABs 📱
+        run: ./gradlew bundleRelease
+
+      - name: Upload APKs 🚀
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+        with:
+          files: app/build/outputs/apk/fdroid/release/*.apk
+
+      - name: Upload APKs bundles 🚀
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+        with:
+          files: app/build/outputs/bundle/fdroidRelease/*.aab