ci: fix GitHub Actions workflow for building and releasing APK

- Add debug keystore generation
- Add keystore.properties creation
- Add artifact upload/download for manual release

Author: OpenCode Bot

.github/workflows/build.yml

@@ -0,0 +1,79 @@
+name: Build and Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version tag (e.g., v1.3.2)'
+        required: true
+        type: string
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v2
+
+      - name: Create debug keystore
+        run: |
+          if [ ! -f "debug.jks" ]; then
+            keytool -genkey -v -keystore debug.jks -alias android -keyalg RSA -keysize 2048 -validity 10000 \
+              -storepass android -keypass android -dname "CN=Android Debug,O=Android,C=US"
+          fi
+
+      - name: Create keystore.properties
+        run: |
+          echo "storeFile=debug.jks" > keystore.properties
+          echo "storePassword=android" >> keystore.properties
+          echo "keyAlias=android" >> keystore.properties
+          echo "keyPassword=android" >> keystore.properties
+
+      - name: Grant execute permission
+        run: chmod +x gradlew
+
+      - name: Build Release APK
+        run: ./gradlew assembleRelease --no-daemon 2>&1
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: apk
+          path: releases/*.apk
+
+      - name: Download APK
+        if: github.event_name == 'workflow_dispatch'
+        uses: actions/download-artifact@v4
+        with:
+          name: apk
+
+      - name: Create Release
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: releases/*.apk
+          generate_release_notes: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload to Release
+        if: github.event_name == 'workflow_dispatch'
+        run: |
+          curl -s -X POST \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Content-Type: application/octet-stream" \
+            "https://uploads.github.com/repos/${{ github.repository }}/releases/${{ github.event.inputs.release_id }}/assets?name=$(ls releases/*.apk | xargs basename)" \
+            --data-binary "@releases/*.apk"