This GitHub Action (written in composite run steps) allows you to leverage GitHub Actions to get the Flutter environment version from the pubspec file. This is primarily used before using the Flutter action.

Create a workflow .yml file in your .github/workflows directory. An example workflow is available below. For more information, reference the GitHub Help Documentation for Creating a workflow file.

For more information on this input, see the Workflow syntax for GitHub Actions

• pubspec-file-path: The pubspec.yaml file path. Optional. Default: pubspec.yaml

For more information on this output, see the Workflow syntax for GitHub Actions and the Context and expression syntax for GitHub Actions

• version: The Flutter version

1. Your pubspec.yaml file must contain the Flutter version under the environment:flutter: key. For example:

environment:
  flutter: 1.22.4

1. Use the action's output as an input to Flutter action. For example:

on: push

name: Sample Workflow

jobs:
  build:
    name: Example
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Get Flutter version
        id: get-flutter-version
        uses: zgosalvez/github-actions-get-flutter-version-env@v2
      - name: Set up Flutter
        uses: subosito/flutter-action@v1
        with:
          flutter-version: ${{ steps.get-flutter-version.outputs.version }}

A special mention goes to @daohoangson, who came up with the initial solution at subosito/flutter-action/issues/47#issuecomment-675821988.

This is used in my opinionated GitHub Actions: Flutter Workflows repository along with other actions for a complete end-to-end DevOps experience.

The scripts and documentation in this project are released under the MIT License