Use repo base name for cleanup workflow

Author: EZForever

.github/workflows/cleanup.yml

@@ -13,11 +13,18 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Get repository name
+        run: |
+          REPOSITORY_NAME="${{ github.repository }}"
+          REPOSITORY_NAME="${REPOSITORY_NAME##*/}"
+          echo "Repository name is: $REPOSITORY_NAME"
+          echo "REPOSITORY_NAME=$REPOSITORY_NAME" >> $GITHUB_ENV
+
       - name: Delete untagged Docker images
         uses: Chizkiyahu/delete-untagged-ghcr-action@v4
         with:
           token: ${{ secrets.GHCR_ACCESS_TOKEN }}
           owner_type: user
-          package_name: ${{ github.repository }}
+          package_name: ${{ env.REPOSITORY_NAME }}
           untagged_only: true