AAE-15950: fix fork check on other events than pull_request (#4398)

* AAE-15950: fix fork check on other events than pull_request

* remove now useless check

.github/actions/check-ext-build/action.yml

@@ -14,7 +14,7 @@ runs:
         REPO_NAME: ${{ github.repository }}
       shell: bash
       run: |
-        if [[ $SENDER_LOGIN != 'dependabot[bot]' && $PR_REPO_NAME == $REPO_NAME ]]
+        if [[ $SENDER_LOGIN != 'dependabot[bot]' && (-z $PR_REPO_NAME || $PR_REPO_NAME == $REPO_NAME) ]]
         then
           exit 0
         fi
@@ -22,9 +22,6 @@ runs:
         if [[ $EVENT_NAME == 'labeled' && $LABEL == 'CI' ]]
         then
           echo "This workflow will run with actor who labeled the PR"
-        elif [ $EVENT_NAME == 'push' ]
-        then
-          echo "This workflow will run with actor who merged the PR"
         else
           echo "This workflow run was triggered by dependabot or an external contributor. Check and validate the changes, then add the 'CI' label to the pull request to trigger this workflow."
           exit 1