fix: switched to string

Author: n3rdc4ptn

.github/workflows/clean-main-images.yml

@@ -27,7 +27,7 @@ jobs:
     steps:
       - uses: dataaxiom/ghcr-cleanup-action@v1
         with:
-          dry-run: ${{ github.event_name == 'workflow_dispatch' && inputs.dry-run == true }}
+          dry-run: ${{ github.event_name == 'workflow_dispatch' && inputs.dry-run == 'true' }}
           packages: ${{ env.IMAGE_NAME }}
           delete-tags: main-*
           delete-untagged: true