Added publishing workflow

Author: Bungeefan

.github/workflows/publish.yml

@@ -0,0 +1,18 @@
+name: Publish to pub.dev
+
+on:
+  push:
+    tags:
+      # must align with the tag-pattern configured on pub.dev, often just replace
+      # {{version}} with [0-9]+.[0-9]+.[0-9]+
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+  workflow_dispatch:
+
+# Publish using the reusable workflow from dart-lang.
+jobs:
+  publish:
+    permissions:
+      id-token: write # Required for authentication using OIDC
+    uses: dart-lang/setup-dart/.github/workflows/publish.yml@v1
+    # with:
+    #   working-directory: path/to/package/within/repository