Initial commit: OpenCode mobile app (extracted from opencode monorepo)

.github/workflows/build.yml

@@ -0,0 +1,59 @@
+name: Build Android APK
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Expo prebuild
+        run: npx expo prebuild --platform android --no-install
+
+      - name: Build APK
+        working-directory: android
+        run: ./gradlew assembleRelease
+
+      - name: Upload APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: app-release
+          path: android/app/build/outputs/apk/release/app-release.apk
+
+  release:
+    needs: build
+    if: startsWith(github.ref, 'refs/tags/v')
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: app-release
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: app-release.apk
+          generate_release_notes: true