Add CI and release pipelines for Android APK builds

Mirrors the Holio setup:

- release.yml: on push to main (e.g. a merged PR), builds the debug APK
  and publishes it as a GitHub Release tagged v1.0.<run-number>.
- ci.yml: pre-merge checks on the dev branch and on PRs targeting dev or
  main — same build plus unit tests and lint, uploaded as artifacts only.

Both expect a Gradle Android project at the repo root with an :app module,
matching Holio's layout.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015qjfMiPUDshdKEUa6vxqzN

.github/workflows/ci.yml

@@ -0,0 +1,66 @@
+name: CI
+
+# Pre-merge checks. Runs on the dev branch and on every pull request aimed at
+# dev or main, so breakage is caught before it reaches main and triggers a
+# release. Builds the same debug APK as the release pipeline, but publishes it
+# only as a workflow artifact — no tag, no GitHub Release.
+on:
+  push:
+    branches: [ dev ]
+  pull_request:
+    branches: [ main, dev ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+# A newer push to the same branch or PR makes the in-flight run obsolete.
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build and check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+          cache: gradle
+
+      - name: Set up Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Build debug APK
+        run: ./gradlew assembleDebug --no-daemon --stacktrace
+
+      - name: Run unit tests
+        run: ./gradlew testDebugUnitTest --no-daemon --stacktrace
+
+      - name: Run Android lint
+        run: ./gradlew lintDebug --no-daemon --stacktrace
+
+      - name: Upload debug APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: ProLibertateGames-debug-apk
+          path: app/build/outputs/apk/debug/app-debug.apk
+          if-no-files-found: error
+          retention-days: 14
+
+      - name: Upload lint and test reports
+        # Reports are most useful precisely when a step above failed.
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ProLibertateGames-reports
+          path: |
+            app/build/reports/
+          if-no-files-found: ignore
+          retention-days: 14

.github/workflows/release.yml

@@ -0,0 +1,70 @@
+name: Build and Release APK
+
+# Build an APK and publish it as a GitHub Release whenever commits land on main
+# (for example when a pull request is merged). Can also be run manually.
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+# Allow the built-in token to create releases and upload the APK.
+permissions:
+  contents: write
+
+# Don't let two pushes to main race on the same release.
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  build:
+    name: Build APK and publish release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+          cache: gradle
+
+      - name: Set up Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Build debug APK
+        run: ./gradlew assembleDebug --no-daemon --stacktrace
+
+      - name: Stage APK for release
+        id: stage
+        run: |
+          set -euo pipefail
+          version="v1.0.${{ github.run_number }}"
+          src="app/build/outputs/apk/debug/app-debug.apk"
+          dest="ProLibertateGames-${version}.apk"
+          cp "$src" "$dest"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+          echo "apk=$dest" >> "$GITHUB_OUTPUT"
+
+      - name: Upload APK as workflow artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ProLibertateGames-apk
+          path: ${{ steps.stage.outputs.apk }}
+          if-no-files-found: error
+
+      - name: Create GitHub release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          gh release create "${{ steps.stage.outputs.version }}" \
+            "${{ steps.stage.outputs.apk }}" \
+            --repo "${{ github.repository }}" \
+            --target "${{ github.sha }}" \
+            --title "ProLibertateGames ${{ steps.stage.outputs.version }}" \
+            --notes "Automated release built from \`${{ github.sha }}\` on push to \`main\`.
+
+          Download **${{ steps.stage.outputs.apk }}** below and install it on an Android device (you may need to allow *Install unknown apps*). This is a debug-signed build."