Setup GitHub Actions

.github/workflows/build.yml

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+name: Android CI
+
+on:
+  workflow_dispatch:
+
+  push:
+    branches: [ master, main ]
+    paths-ignore: [ '*.md' ]
+  pull_request:
+    branches: [ master, main ]
+    paths-ignore: [ '*.md' ]
+
+  release:
+    types: [ published ]
+
+jobs:
+  validation:
+    name: Gradle Validation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gradle/wrapper-validation-action@v1
+
+  build:
+    name: Build (debug)
+    runs-on: ubuntu-latest
+    needs: validation
+
+    if: ${{ needs.validation.result == 'success' && (github.event_name != 'push' || !startsWith(github.event.head_commit.message, '[skip ci]')) }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: errr-maxx-builds/android-setup-build-env@master
+        with:
+          usePatchedSDK: true # custom
+
+      - shell: bash
+        run: |
+
+          # Setup GITHUB_SHA
+          if [[ "$GITHUB_EVENT_NAME" = 'pull_request' ]]; then
+            GITHUB_SHA="${{ github.event.pull_request.head.sha }}" # Do not use last merge commit set in GITHUB_SHA
+          fi
+          GITHUB_SHA="${GITHUB_SHA:0:7}"
+
+          # App/apk name
+          APP_NAME="${{ github.event.repository.name }}-${GITHUB_SHA}"
+          echo APP_NAME="$APP_NAME" >> "$GITHUB_ENV"
+
+          # Build
+          ./gradlew assembleDebug || exit $?
+          mv ./app/build/outputs/apk/debug/app-debug.apk "./${APP_NAME}.apk"
+
+      - uses: errr-maxx-builds/android-sign-apk@master
+        with:
+          in:  ./${{ env.APP_NAME }}.apk
+          out: ./${{ env.APP_NAME }}.apk
+          ks:      ${{ secrets.SIGNING_KEYSTORE }}
+          ksPass:  ${{ secrets.SIGNING_KEYSTORE_PASSWORD }}
+          key:     ${{ secrets.SIGNING_ALIAS }}
+          keyPass: ${{ secrets.SIGNING_ALIAS_PASSWORD }}
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: ${{ env.APP_NAME }}
+          path: ./${{ env.APP_NAME }}.apk
+
+  upload:
+    name: Upload release
+    runs-on: ubuntu-latest
+    needs: build
+
+    if: ${{ needs.build.result == 'success' && github.event_name == 'release' }}
+
+    steps:
+      - uses: actions/download-artifact@v3
+      - uses: termux/[email protected]
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: "**/*.apk"
+          file_glob: true
+          tag: ${{ github.event.release.tag_name }}
+          checksums: sha256,sha512,md5