ci: re-combine size compare workflow

Author: danielroe

.github/workflows/size-comment.yml

@@ -1,21 +1,27 @@
-name: size-build
+name: size
 on:
-  pull_request:
+  # this action will error unless run in a pr context
+  pull_request_target:
     branches:
       - main
 
 env:
   BUNDLE_SIZE: true
 
-permissions:
-  contents: read
+permissions: {}
 
 jobs:
   # Build current and upload stats.json
+  # You may replace this with your own build method. All that
+  # is required is that the stats.json be an artifact
   build-head:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - run: corepack enable
       - uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
         with:
@@ -34,8 +40,12 @@ jobs:
           path: ./packages/*/stats.json
 
   # Build base for comparison and upload stats.json
+  # You may replace this with your own build method. All that
+  # is required is that the stats.json be an artifact
   build-base:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
         with:
@@ -56,3 +66,23 @@ jobs:
         with:
           name: base-stats
           path: ./packages/*/stats.json
+
+  # run the action against the stats.json files
+  compare:
+    runs-on: ubuntu-latest
+    needs: [build-base, build-head]
+    permissions:
+      pull-requests: write
+      issues: write
+    strategy:
+      matrix:
+        package: [nuxi, nuxt-cli, create-nuxt]
+    steps:
+      - name: ⏬ Download stats.json
+        uses: actions/download-artifact@v5
+      - uses: twk3/rollup-size-compare-action@v1.2.0
+        with:
+          title: ${{ matrix.package }} size comparison
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          current-stats-json-path: ./head-stats/${{ matrix.package }}/stats.json
+          base-stats-json-path: ./base-stats/${{ matrix.package }}/stats.json