test: add compressed-size-action (#163)

* test: add compressed-size-action

* fix: fixup

* fix: fixup

* fix: fixup

.github/workflows/bundlesize.yml

@@ -0,0 +1,33 @@
+name: Compressed Size
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 14
+
+      # via https://github.com/actions/cache/blob/0638051/examples.md#node---yarn
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - uses: actions/cache@v2
+        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+
+      - uses: preactjs/compressed-size-action@v2
+        with:
+          build-script: benchmark:bundle
+          pattern: "./bundle.js"
+          compression: "none"