RFC-6: Move to GIT

As noted on ​https://lists.osgeo.org/pipermail/postgis-devel/2019-October/028199.html and ​https://lists.osgeo.org/pipermail/postgis-devel/2019-October/028184.html we all voted to move to Git and Gitea for our Git repo. We will still have a git mirror on github and gitlab and allow pull requests on github, gitlab, and gitea. Trac will still be our issue tracker for now and repointed to GIT

This document is to outline the steps we'll be doing to move from SVN to git.

• Upgrade gitea to latest 1.9.4 (done)
• Upgrade trac to latest 1.4 (in progess - have upgraded on ​https://dev.trac.osgeo.org/postgis to test to see if any issues)
  • Markus Neteler noticed the SectionEditor Plugin is missing in 1.4 which is something most of our trac instances use. He said would be nice to have it but we could try to patch or live without it.
  • Verify Email notifications are working in new trac version
• Change all the svn references in trac tickets to corresponding git references
• Change trac repo pointing to git repo instead of svn repo
• Put SVN in readonly mode
• Change mirroring from svn-git to git-git (with github and gitlab mirroring from gitea)
• Move git mirroring logic to an osgeo server (from strk's personal computer or possibly set up as gitlab pulls from gitea and feeds to github)