chore: Add compressed size action (#29337)

.github/workflows/compressed-size.yml

@@ -0,0 +1,18 @@
+name: 📦 Compressed Size
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: preactjs/compressed-size-action@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        pattern: "./dist/**/*.min.{js,css}"
+        build-script: "dist:esbuild"