Fix for docker signing (#3363)
Fix for docker signing (#3363)

- Add required "images" attribute
- Ref: https://github.com/docker/metadata-action#images-input
SchrodingersGat/InvenTree,inventree/InvenTree,SchrodingersGat/InvenTree,SchrodingersGat/InvenTree,inventree/InvenTree,inventree/InvenTree,inventree/InvenTree,SchrodingersGat/InvenTree