use actions-ecosystem

Author: eleanorjboyd

.github/workflows/pr-file-check.yml

@@ -41,6 +41,11 @@ jobs:
           skip-label: 'skip tests'
           failure-message: 'TypeScript code was edited without also editing a ${file-pattern} file; see the Testing page in our wiki on testing guidelines (the ${skip-label} label can be used to pass this check)'
 
+      - name: 'Add issue-please labe on PR open'
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          labels: 'issue-please'
+        
       - name: 'Ensure PR has an associated issue'
         uses: actions/github-script@v7
         with: