.github/workflows/build_apk.yml

name: Build Flutter APK

on:
push:
branches: [ main ]
pull_request:
branches: [ main ]

jobs:
build:
name: Build APK
runs-on: ubuntu-latest

steps:
  - name: Checkout repository
    uses: actions/checkout@v3

  - name: Setup Flutter
    uses: subosito/flutter-action@v2
    with:
      flutter-version: '3.13.0'

  - name: Install dependencies
    run: flutter pub get

  - name: Build APK
    run: flutter build apk --release

  - name: Upload APK
    uses: actions/upload-artifact@v3
    with:
      name: snabbit-apk
      path: build/app/outputs/flutter-apk/app-release.apk

The proposed workflow is in .github/workflows/build_apk.yml; start by checking the repository's Flutter setup and whether the listed Flutter version and artifact path match it. Run the workflow's commands, including flutter pub get and flutter build apk --release. Done means the GitHub Actions job completes and uploads the snabbit-apk artifact.