Add custom GHA report for package size (#53241)

.github/workflows/ci.yml

@@ -89,38 +89,15 @@ jobs:
 
   smoke:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ./pr
 
     steps:
     - uses: actions/checkout@v3
-      with:
-        path: pr
-
-    - uses: actions/checkout@v3
-      with:
-        path: base
-        ref: ${{ github.base_ref }}
-      if: github.event_name == 'pull_request'
 
     - uses: actions/setup-node@v3
       with:
         node-version: "*"
         check-latest: true
     
-    # Pre-build the base branch so we can check lib folder size changes.
-    # Note that github.sha points to a merge commit, meaning we're testing
-    # the base branch versus the base branch with the PR applied.
-    - name: Build base LKG
-      if: github.event_name == 'pull_request'
-      run: |
-        npm ci
-        npx hereby lkg
-        rm -rf $GITHUB_WORKSPACE/pr/lib
-        mv ./lib $GITHUB_WORKSPACE/pr/
-      working-directory: ./base
-
     - run:  npm ci
 
     - run: npx hereby lkg
@@ -177,6 +154,41 @@ jobs:
         node ./smoke.js typescript
         node ./smoke.js typescript/lib/tsserverlibrary
 
+  package-size:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        path: pr
+
+    - uses: actions/checkout@v3
+      with:
+        path: base
+        ref: ${{ github.base_ref }}
+
+    - uses: actions/setup-node@v3
+      with:
+        node-version: "*"
+        check-latest: true
+
+    - run: npm ci
+      working-directory: ./pr
+
+    - run: npm ci
+      working-directory: ./base
+
+    - run: npx hereby lkg
+      working-directory: ./pr
+      
+    - run: npx hereby lkg
+      working-directory: ./base
+
+    - run: |
+        echo "See $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID for more info."
+        node ./pr/scripts/checkPackageSize.mjs ./base ./pr >> $GITHUB_STEP_SUMMARY
+
   misc:
     runs-on: ubuntu-latest