Create blank.yml

.github/workflows/blank.yml

+# This is a basic workflow to help you get started with Actions
+
+name: Build Checks
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: macos-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+
+    - name: Flutter action
+      uses: subosito/flutter-action@v1.3.2
+      with:
+        # The Flutter build release channel
+        channel: beta
+    - name: Build APK
+      run: flutter build apk
+    - name: Build For iOS
+      run: flutter build ios --release --no-codesign