Instead of having an explicit vX.Y-dev version to be referenced
explicitly, a binary built from source replaces the matching
version. For instance, if forgejo/build-from-sources contains v9.0,
* the development branch is compiled from source
* the v9.0 artifact is uploaded
* prior to running any test, the artificat is downloaded and used
* the v9.0 binary is not downloaded from
forgejo/experimental/integration because it is already present
The vX.Y release is built daily and the end-to-end tests run on it. If
a regression is introduced, it will be spotted within 24h.
Compiling from source is used when the Forgejo runs the end-to-end
suite on a specific pull request.
