Build Rules - Regex Matching

[ShaneMcC]

DockerHub allows creating automated build rules that match a regex on the source ref of a build rather than needing to create separate rules for every target, this is nice for setting up a rule for "build every tagged release" automatically. (And would tie in with #6)

[csmith]

This is now done, but not really shown very well in the UI.

When creating a rule the refspec can be a regexp, and then push targets can contain references to the capturing groups in the format of $1, $2 etc.

Remaining work:

• Make the UI show this is possible
• Make the "Launch new build" button do something useful (it currently uses the configured refspec, regexp syntax and all)
• Expose the ref spec in the build logs table