feat: add GitHub Actions workflow for publishing Dart packages to pub.dev

Author: indrajit-roy-sc

.github/workflows/publishV2.yml

@@ -0,0 +1,45 @@
+name: Publish V2
+
+on:
+  workflow_dispatch:
+    inputs:
+      working-directory:
+        description: "Working directory"
+        required: true
+        type: choice
+        options:
+          - scgateway
+          - loans
+        default: "scgateway"
+
+jobs:
+  publish:
+    name: "Publish to pub.dev"
+    permissions:
+      id-token: write # This is required for requesting the JWT
+    runs-on: ubuntu-latest
+    steps:
+      # Checkout repository
+      - uses: actions/checkout@v4
+      # Set up the Dart SDK and provision the OIDC token used for publishing.
+      # The `dart` command from this step will be shadowed by the one from the
+      # Flutter SDK below.
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+      # Download flutter SDK - needed for publishing Flutter packages. Can also
+      # publish pure Dart packages.
+      #
+      # The dart binary from a Flutter SDK facilitates publishing both Flutter
+      # and pure-dart packages.
+      - uses: flutter-actions/setup-flutter@54feb1e258158303e041b9eaf89314dcfbf6d38a
+      # Minimal package setup and dry run checks.
+      - name: Install dependencies
+        run: flutter pub get
+        working-directory: ${{ inputs.working-directory }}
+      - name: Publish - dry run
+        run: flutter pub publish --dry-run
+        continue-on-error: true
+        working-directory: ${{ inputs.working-directory }}
+      # Publishing...
+      - name: Publish to pub.dev
+        run: flutter pub publish -f
+        working-directory: ${{ inputs.working-directory }}