Make sure various clones of our Git repository are up-to-date wrt. the rewrite

Originally created by @intrigeri on #8632 (Redmine)

• website, Jenkins, mirror at immerda and Redmine, etc.
• check tags too

Parent Task: tails/tails#6277

Related issues

• Blocked by tails/sysadmin#8631
• Blocks tails/tails#8633