Fix CI improvements

Please review @jschlehofer comments on eb7c4cae

  • Use our own registry if possible
  • Verify TLS certificate while cloning a git repo
  • Review release.sh and fix file names

And from 4ca6e822

  • Probably a typo in .gitignore comment header
Edited by Vojtech Myslivec
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information