add label to external PR

Author: tommartensen

.github/workflows/add-new-pr-to-oss-triaging.yml

@@ -4,6 +4,7 @@ on:
     types: [opened, reopened]
 
 env:
+  EXTERNAL_PR_LABEL: external-contributor
   PROJECT_URL: https://github.com/orgs/stackrox/projects/3 # Test board for PR automation
   # PROJECT_URL: https://github.com/orgs/stackrox/projects/2 # OSS Triaging board
 
@@ -18,19 +19,24 @@ jobs:
     outputs:
       is_external_pr: ${{ steps.check-external-pr.outputs.is_external_pr }}
     steps:
+      - name: Check out code
+        uses: actions/checkout@v3
       - id: check-external-pr
         run: |
           set -uo pipefail
           if [[ $BASE_REPO != $HEAD_REPO ]]; then
             echo "::set-output name=is_external_pr::true"
+            gh pr edit \
+              ${{ github.event.pull_request.number }} \
+              --add-label ${EXTERNAL_PR_LABEL}
           else
             echo "::set-output name=is_external_pr::false"
           fi
 
   add-to-project:
     name: Add pull request to project
     runs-on: ubuntu-latest
-    needs: [check-pr-if-externall]
+    needs: [check-pr-if-external]
     if: needs.check-pr-if-external.outputs.is_external_pr == 'true'
     steps:
       - uses: actions/add-to-project@v0.3.0