fix: use subdirectory for @excalidraw/excalidraw size limit (#6787)

* fix: use subdirectory for @excalidraw/excalidraw size limit

* fix

* update yml

* update path

* fix

* fix

* better

.github/workflows/size-limit.yml

@@ -15,10 +15,16 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: 18.x
+      - name: Install
+        run: yarn --frozen-lockfile
+      - name: Install in src/packages/excalidraw
+        run: yarn --frozen-lockfile
+        working-directory: src/packages/excalidraw
         env:
           CI: true
       - uses: andresz1/size-limit-action@v1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          build_script: size
+          build_script: build:umd
           skip_step: install
+          directory: src/packages/excalidraw