Automated image builds for registry

By using CI, builds can be scheduled and the process is unambiguous.

Fixes #2 (closed)

Incidentally, fixed #3 (closed) as part of overall cleanup.

README.md

@@ -4,4 +4,4 @@ A collection of images used with GitLab CI, built using GitLab CI. ♾
 
 ## Use
 
-See this project's container registry.
+See this project's container registry for available images.