dnf5 does not recognize the `--` argument to mean "end of arguments"
like DNF 4 did. To terminate the argument list, we need to use the "and
nothing" shell syntax.
* Use `matrix` to generate pipelines for multiple Fedora versions
* Sign RPM packages using the Jenkins GPG key
* Publish RPM files to *dch* repository on *files.pyrocufflink.blue*
instead of Gitea (the latter cannot handle multiple releases of the
same package)
