feat: Workflow for publishing

.github/scripts/publish.dart

@@ -0,0 +1,25 @@
+import 'dart:io';
+import 'dart:convert' show Encoding;
+
+main() {
+  var gitroot = Process.runSync(
+    'git',
+    [
+      'rev-parse',
+      '--show-toplevel',
+    ],
+    stdoutEncoding: Encoding.getByName('utf-8'),
+  ).stdout as String;
+
+  var version = File(gitroot.trim() + '/pubspec.yaml')
+      .readAsLinesSync()
+      .firstWhere((line) {
+        return line.contains('version:', 0);
+      })
+      .split(':')[1]
+      .trim();
+
+  // TODO: check the changelog for the version to be present
+  // TODO: create a tag if not exists: git tag v<version>
+  // TODO: git push origin <tag>
+}

.github/workflows/publish.yml

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+name: 🚀 Publish to pub.dev
+
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+*'
+
+concurrency:
+  group: ci-${{github.actor}}-${{github.head_ref || github.run_number}}-${{github.ref}}-publish
+  cancel-in-progress: true
+
+jobs:
+  publish:
+    permissions:
+      id-token: write
+    uses: dart-lang/setup-dart/.github/workflows/publish.yml@v1
+    with:
+      environment: 'pub.dev'