fix: license_check failed on flutter pkgs

Closes #297

Allow callers to specify a `flutter_version` or `dart_sdk` to control
which SDK is used for dependency resolution. When `flutter_version` is
provided, the workflow installs Flutter and uses `flutter pub get`.
Otherwise it defaults to the stable Dart SDK with `dart pub get`.

- Add `flutter_version` input to license_check workflow
- Route SDK setup and dependency install based on input
- Warn when both `flutter_version` and `dart_sdk` are specified
- Show notice when neither is specified, suggesting `flutter_version`
  for Flutter projects
- Add CI jobs covering all four input combinations
- Update docs site to document the new input

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: JohnWeidner

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
     with:
       modified_files_only: false
 
-  verify-license-check:
+  verify-license-check-no-sdk:
     uses: ./.github/workflows/license_check.yml
     with:
       working_directory: examples/dart_package
@@ -55,6 +55,31 @@ jobs:
       forbidden: "unknown"
       skip_packages: "very_good_analysis"
 
+  verify-license-check-dart-only:
+    uses: ./.github/workflows/license_check.yml
+    with:
+      working_directory: examples/dart_package
+      dart_sdk: "stable"
+      dependency_type: "direct-dev"
+      allowed: ""
+      forbidden: "unknown"
+      skip_packages: "very_good_analysis"
+
+  verify-license-check-flutter-only:
+    uses: ./.github/workflows/license_check.yml
+    with:
+      working_directory: examples/flutter_package
+      flutter_version: "3.41.x"
+      allowed: "MIT,BSD-3-Clause,BSD-2-Clause,Apache-2.0,Zlib"
+
+  verify-license-check-both:
+    uses: ./.github/workflows/license_check.yml
+    with:
+      working_directory: examples/flutter_package
+      flutter_version: "3.41.x"
+      dart_sdk: "stable"
+      allowed: "MIT,BSD-3-Clause,BSD-2-Clause,Apache-2.0,Zlib"
+
   build:
     needs:
       [
@@ -64,7 +89,10 @@ jobs:
         verify-pana-flutter,
         verify-semantic-pull-request,
         verify-spell-check,
-        verify-license-check,
+        verify-license-check-no-sdk,
+        verify-license-check-dart-only,
+        verify-license-check-flutter-only,
+        verify-license-check-both,
       ]
 
     runs-on: ubuntu-latest

.github/workflows/license_check.yml

@@ -12,9 +12,13 @@ on:
         type: string
         default: "ubuntu-latest"
       dart_sdk:
+        description: 'Dart SDK to use when no flutter_version is specified'
+        required: false
+        type: string
+      flutter_version:
+        description: 'Flutter SDK version to use'
         required: false
         type: string
-        default: "stable"
       allowed:
         required: false
         type: string
@@ -46,15 +50,43 @@ jobs:
         working-directory: ${{inputs.working_directory}}
 
     runs-on: ${{inputs.runs_on}}
+    env:
+      USE_FLUTTER: ${{ inputs.flutter_version != '' }}
+      USE_DART: ${{ inputs.flutter_version == '' }}
+      SHOW_DART_FLUTTER_WARNING: ${{ inputs.flutter_version != '' && inputs.dart_sdk != '' }}
+      NO_SDK_SPECIFIED: ${{ inputs.flutter_version == '' && inputs.dart_sdk == '' }}
 
     steps:
       - name: 📚 Git Checkout
         uses: actions/checkout@v6
 
-      - name: 🎯 Setup Dart
+      - name: ℹ️ No SDK specified
+        if: ${{ env.NO_SDK_SPECIFIED == 'true' }}
+        run: echo "::notice::No 'flutter_version' or 'dart_sdk' was specified. Defaulting to the stable Dart SDK. If this is a Flutter project, specify 'flutter_version' to use 'flutter pub get' for dependency resolution."
+
+      - name: Show warning if conflicting SDK inputs
+        if: ${{ env.SHOW_DART_FLUTTER_WARNING == 'true' }}
+        run: echo "::warning::Both 'flutter_version' and 'dart_sdk' were specified. The workflow will proceed with the Flutter SDK setup."
+
+      - name: Set Dart SDK Version
+        if: ${{ env.USE_DART == 'true' }}
+        id: set_dart_version
+        run: |
+          echo "dart_sdk_version=${{ inputs.dart_sdk || 'stable' }}" >> $GITHUB_OUTPUT
+
+      - name: 🦋Set up Flutter
+        if: ${{ env.USE_FLUTTER == 'true' }}
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: ${{inputs.flutter_version}}
+          cache: true
+          cache-key: flutter-:os:-:channel:-:version:-:arch:-:hash:-${{ hashFiles('**/pubspec.lock') }}
+
+      - name: 🎯 Set up Dart
+        if: ${{ env.USE_DART == 'true' }}
         uses: dart-lang/setup-dart@v1
         with:
-          sdk: ${{inputs.dart_sdk}}
+          sdk: ${{steps.set_dart_version.outputs.dart_sdk_version}}
 
       - name: 🤫 Set SSH Key
         env:
@@ -64,7 +96,12 @@ jobs:
         with:
           ssh-private-key: ${{secrets.ssh_key}}
 
-      - name: 📦 Install Dependencies
+      - name: 📦 Install Dependencies for Flutter
+        if: ${{ env.USE_FLUTTER == 'true' }}
+        run: flutter pub get --no-example
+
+      - name: 📦 Install Dependencies for Dart
+        if: ${{ env.USE_DART == 'true' }}
         run: dart pub get --no-example
 
       - name: 👨‍⚖️ Check licenses

site/docs/workflows/license_check.md

@@ -35,10 +35,16 @@ The License Check workflow consists of the following steps:
 
 ### `dart_sdk`
 
-**Optional** Which Dart SDK version to use. It can be a version (e.g. `3.5.0`) or a channel (e.g. `stable`):
+**Optional** Which Dart SDK version to use. It can be a version (e.g. `3.5.0`) or a channel (e.g. `stable`). This parameter is ignored if a flutter_version is specified.
 
 **Default** `"stable"`
 
+### `flutter_version`
+
+**Optional** Which Flutter SDK version to use.
+
+**Default** `""`
+
 ### `allowed`
 
 **Optional** Only allow the use of certain licenses. The expected format is a comma-separated list.
@@ -104,7 +110,8 @@ jobs:
   license_check:
     uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/license_check.yml@v1
     with:
-      allowed: 'MIT,BSD-3-Clause,BSD-2-Clause,Apache-2.0'
+      flutter_version: '3.32.0'
+      allowed: 'MIT,BSD-3-Clause,BSD-2-Clause,Apache-2.0,Zlib'
 ```
 
 The example [workflow file](https://docs.github.com/en/actions/quickstart#creating-your-first-workflow) will [trigger](https://docs.github.com/en/actions/using-workflows/triggering-a-workflow) the `license_check` job on every push to the `main` branch and on every pull request that modifies the `pubspec.yaml` or the `license_check.yaml` workflow file.