Forgot to add checkout action

Author: rzuckerm

.github/workflows/pr-labeler.yml

@@ -1,10 +1,10 @@
 name: "Pull Request Labeler"
 on:
-  pull_request:
+  push:
     branches:
     - main
-    types:
-    - opened
+    paths:
+    - '!archive/*/*/*.md'
 
 jobs:
   pr-labeler:
@@ -13,6 +13,8 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
+    - uses: actions/checkout@v6
+
     - uses: actions/labeler@v6
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}