add label for registry description

Author: NiklasMerz

Dockerfile

@@ -4,6 +4,7 @@ LABEL "com.github.actions.name"="Github Deployment"
 LABEL "com.github.actions.description"="Create a Github deployment and set a status"
 LABEL "com.github.actions.icon"="moon"
 LABEL "com.github.actions.color"="green"
+LABEL org.opencontainers.image.description DESCRIPTION="Create a Github deployment and set a status"
 
 LABEL "repository"="https://github.com/NiklasMerz/github-deployment-action"
 LABEL "maintainer"="Niklas Merz"