FORGEJO_* environment variables are set to the corresponding GITEA_*
variable when the cli starts. This approach is intended to minimize
the conflicts on rebase. All occurences of GITEA_* are left untouched
in the codebase and they are only changed to FORGEJO_* if exposed to
the user.
(cherry picked from commit e466f9d10e145a3ed750f0c86cfcafad5f141ea8)
(cherry picked from commit e33e95931b0d91c41433db68ddb19a8724b8ed80)
(cherry picked from commit 5f528f0a25)
(cherry picked from commit 65146bfbcd1102a8e182ac6967804659fea9651f)
(cherry picked from commit 393eede84a)
(cherry picked from commit df68ae9d1f)
(cherry picked from commit 2f05b0cc1f)