Fixing slug issue.

Author: colinmurphy

.github/workflows/plugin-artifact-for-pr.yml

@@ -17,6 +17,7 @@ jobs:
       - name: Get changed plugin directory
         id: plugin
         run: |
+          git fetch --prune --unshallow
           plugin=$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | grep '^plugins/' | head -1 | cut -d/ -f2)
           echo "slug=$plugin" >> $GITHUB_OUTPUT