feat: Add GitHub workflow to build debug APK

This workflow allows for the manual creation of a debug APK. It can be triggered from the Actions tab in the GitHub repository.

The workflow builds the debug APK and uploads it as a build artifact named 'app-debug', which can then be downloaded by users.

.github/workflows/build-debug-apk.yml

@@ -0,0 +1,28 @@
+name: "Build debug APK"
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+          cache: 'gradle'
+
+      - name: "Set up Android SDK"
+        uses: android-actions/setup-android@v3
+
+      - name: "Build debug APK"
+        run: ./gradlew assembleDebug --stacktrace
+
+      - name: "Upload APK"
+        uses: actions/upload-artifact@v4
+        with:
+          name: app-debug
+          path: app/build/outputs/apk/debug/app-debug.apk