chore: Add GitHub Actions workflow for building WXT Extension

.github/workflows/build-extension.yaml

@@ -0,0 +1,42 @@
+name: Build WXT Extension
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+  pull_request:
+    branches:
+      - main
+      - develop
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .node-version
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build extension
+        run: pnpm run zip
+
+      - name: Build extension for firefox
+        run: pnpm run zip:firefox
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: extension
+          path: .output/*.zip