Adding back "homepage" label to Dockerfile

Author: ksaykova

.cloud66/cx/Dockerfile

@@ -5,6 +5,7 @@ LABEL "com.github.actions.description"="GitHub Action that allows you to perform
 LABEL "com.github.actions.icon"="upload-cloud"
 LABEL "com.github.actions.color"="green"
 LABEL "repository"="http://github.com/cloud66/github-actions"
+LABEL "homepage"="http://github.com/cloud66/github-actions"
 LABEL "maintainer"="Cloud66 <https://www.cloud66.com/>"
 
 ADD entrypoint.sh /