Update pipeline to use Flutter

.github/workflows/publish.yml

@@ -4,19 +4,25 @@ name: Publish to pub.dev
 on:
   push:
     tags:
-    # must align with the tag-pattern configured on pub.dev, often just replace
-    #  with [0-9]+.[0-9]+.[0-9]+*
-    - 'v[0-9]+.[0-9]+.[0-9]+*' # tag-pattern on pub.dev: 'v'
-    # If you prefer tags like '1.2.3', without the 'v' prefix, then use:
-    # - '[0-9]+.[0-9]+.[0-9]+*' # tag-pattern on pub.dev: ''
-    # If your repository contains multiple packages consider a pattern like:
-    # - 'my_package_name-v[0-9]+.[0-9]+.[0-9]+*'
+      - 'v[0-9]+.[0-9]+.[0-9]+*' # Adjust according to your versioning pattern
 
-# Publish using the reusable workflow from dart-lang.
 jobs:
+  setup:
+    name: Setup Flutter
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: 'stable'
+
+      - name: Install dependencies
+        run: flutter pub get
+
   publish:
+    needs: setup
     permissions:
-      id-token: write # Required for authentication using OIDC
+      id-token: write
     uses: dart-lang/setup-dart/.github/workflows/publish.yml@v1
-    # with:
-    #   working-directory: path/to/package/within/repository