Setup GitHub Actions

.github/workflows/build-debug.yml

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+name: Build APK (debug)
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [master, main]
+    paths-ignore: ['*.md']
+  pull_request:
+    branches: [master, main]
+    paths-ignore: ['*.md']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: ${{ contains(fromJSON('["workflow_dispatch", "pull_request"]'), github.event_name) || !startsWith(github.event.head_commit.message, '[skip ci]') }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - run: |
+          APP_VERSION="v$(cat ./app/build.gradle     | grep -m1 versionName | awk -F'"' '{ print $2; }')" ||
+          APP_VERSION="v$(cat ./app/build.gradle.kts | grep -m1 versionName | awk -F'"' '{ print $2; }')"
+          echo APP_VERSION="$APP_VERSION" >> "$GITHUB_ENV"
+          echo APP_NAME="${{ github.event.repository.name }}_${APP_VERSION}-DEBUG#${{ github.run_number }}" >> "$GITHUB_ENV"
+
+          # Inject run number into versionName
+          sed -i -e 's/versionName "\([0-9\.]\+\)"/versionName "\1-${{ github.run_number }}"/' ./app/build.gradle ||
+          sed -i -e 's/versionName = "\([0-9\.]\+\)"/versionName = "\1-${{ github.run_number }}"/' ./app/build.gradle.kts
+        shell: bash
+
+      - uses: errr-maxx-builds/android-setup-build-env@master
+        with:
+          usePatchedSDK: true # custom
+      - uses: errr-maxx-builds/android-build-apk@master
+        with:
+          buildType: debug
+
+      - run: mv ./app/build/outputs/apk/debug/app-debug.apk "./${{ env.APP_NAME }}.apk"
+
+      - uses: errr-maxx-builds/android-sign-apk@master
+        with:
+          inputFile:  ./${{ env.APP_NAME }}.apk
+          outputFile: ./${{ env.APP_NAME }}.apk
+          keyStore:         ${{ secrets.SIGNING_KEYSTORE }}
+          keyStorePassword: ${{ secrets.SIGNING_KEYSTORE_PASSWORD }}
+          keyAlias:         ${{ secrets.SIGNING_ALIAS }}
+          keyPassword:      ${{ secrets.SIGNING_ALIAS_PASSWORD }}
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: ${{ env.APP_NAME }}
+          path: ./${{ env.APP_NAME }}.apk

.github/workflows/validate-gradle.yml

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+name: Validate Gradle Wrapper
+
+on:
+  push:
+    branches: [master, main]
+    paths-ignore: ['*.md']
+  pull_request:
+    branches: [master, main]
+    paths-ignore: ['*.md']
+
+jobs:
+  validation:
+    name: Gradle Validation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gradle/wrapper-validation-action@v1