feat: add Play Store publish workflow and signing config

.github/workflows/publish-play-store.yml

@@ -0,0 +1,58 @@
+name: Publish to Google Play Store
+
+on:
+  release:
+    types: [published]
+  push:
+    tags: ["v*"]
+
+jobs:
+  publish:
+    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: Decode keystore
+        run: echo "${{ secrets.KEYSTORE_BASE64 }}" | base64 -d > android/app/release.keystore
+
+      - name: Build AAB
+        working-directory: android
+        env:
+          RELEASE_STORE_FILE: release.keystore
+          RELEASE_STORE_PASSWORD: ${{ secrets.KEYSTORE_PASSWORD }}
+          RELEASE_KEY_ALIAS: ${{ secrets.KEY_ALIAS }}
+          RELEASE_KEY_PASSWORD: ${{ secrets.KEY_PASSWORD }}
+        run: ./gradlew bundleRelease
+
+      - name: Upload AAB artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: app-release-bundle
+          path: android/app/build/outputs/bundle/release/app-release.aab
+
+      - name: Publish to Play Store
+        uses: r0adkll/upload-google-play@v1
+        with:
+          serviceAccountJsonPlainText: ${{ secrets.PLAY_STORE_SERVICE_ACCOUNT_JSON }}
+          packageName: ai.opencode.mobile
+          releaseFiles: android/app/build/outputs/bundle/release/app-release.aab
+          track: internal
+          status: completed