more automation

frontend/.github/workflows/build_app_android.yaml

@@ -0,0 +1,39 @@
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: macos-lastest
+    steps:
+      - uses: actions/checkout@v2
+  
+      - name: Set up ruby env
+        uses: ruby/setup-ruby@v1.138.0
+        with:
+          ruby-version: 3.2.1
+          bundler-cache: true
+      
+      - name: Setup java for android build
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'zulu'
+      
+      - name: Setup android SDK
+        uses: https://github.com/android-actions/setup-android@v3
+
+      - name: Infer version number from git tag
+        id: version
+        env: 
+          REF_NAME: ${{ github.ref_name }}
+        run:
+          # remove the 'v' prefix from the tag name
+          echo "VERSION=${REF_NAME//v}" >> $GITHUB_ENV
+
+      - name: Run fastlane lane
+        run: bundle exec fastlane android build
+        working-directory: android
+        env:
+          VERSION_NAME: ${{outputs.version.VERSION}}