Now that Forgejo has its own release number, use the Makefile as a
reference.
Also document and improve support for debugging this
pull_request_target workflow by using a branch in the repository.
(cherry picked from commit ded1f27ebb)
(cherry picked from commit e452b18455)
[CI] upload the forgejo under test as an artifact for end-to-end (squash) use forgejo-pr
cascade a PR to https://code.forgejo.org/forgejo/end-to-end on the
forgejo-pr branch which will only run end-to-end tests relevant to a
Forgejo PR and not the entire end-to-end suite.
(cherry picked from commit 011de92174)
(cherry picked from commit 50290011b2)
[CI] upload the forgejo under test as an artifact for end-to-end (squash) after build
(cherry picked from commit ba35f42e3d)
(cherry picked from commit ddf43faecb)
[CI] upload the forgejo under test as an artifact for end-to-end (squash) do not display env
(cherry picked from commit d186ec3db4)
(cherry picked from commit 20e9d4bffb)
[CI] upload the forgejo under test as an artifact for end-to-end (squash) merge feature branches
(cherry picked from commit 83cd7a3ad9)
(cherry picked from commit 75fd819ee5)
(cherry picked from commit c6d0216929)
(cherry picked from commit 4a0ee31376)
(cherry picked from commit 5f440052fb)
(cherry picked from commit e603cd3dcf)
(cherry picked from commit f1c5e86d83)
