ci: setup bundle size action

.github/workflows/bundle-size.yml

@@ -0,0 +1,34 @@
+name: Bundle Size
+
+on:
+  push:
+    branches:
+      - ci-bundle-size-action
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  bundle-size:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Restore node_modules
+        id: yarn-cache
+        uses: actions/cache@v4
+        with:
+          path: "**/node_modules"
+          key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
+      - name: Use Node.js from .nvmrc
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ".nvmrc"
+      - name: Install
+        if: steps.yarn-cache.outputs.cache-hit != 'true'
+        run: CYPRESS_INSTALL_BINARY=0 yarn install
+      - name: Build assets
+        run: yarn build
+      - uses: preactjs/compressed-size-action@v2
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          clean-script: "clean"