Service fails to find go.mod for certgen

[kastl-ars]

Another instance of the service not finding the go.mod file:

https://github.com/minio/certgen/tree/v1.3.0

Running source_service 'go_modules' ...
INFO:obs-service-go_modules:Running OBS Source Service: obs-service-go_modules
INFO:obs-service-go_modules:Autodetecting archive since no archive param provided in _service
DEBUG:obs-service-go_modules:Trying to find archive name with pattern certgen*.tar.gz
DEBUG:obs-service-go_modules:Trying to find archive name with pattern certgen*.tar.xz
DEBUG:obs-service-go_modules:Trying to find archive name with pattern certgen*.tar.zst
DEBUG:obs-service-go_modules:Trying to find archive name with pattern certgen*.tar.lz
DEBUG:obs-service-go_modules:Trying to find archive name with pattern certgen*.tar.bz2
DEBUG:obs-service-go_modules:Trying to find archive name with pattern certgen*.obscpio
INFO:obs-service-go_modules:Archive autodetected at /XXX/certgen/certgen-1.3.0.obscpio
INFO:obs-service-go_modules:Using archive certgen-1.3.0.obscpio
INFO:obs-service-go_modules:Extracting certgen-1.3.0.obscpio to /tmp/tmpvu5q022p
INFO:obs-service-go_modules:Switching to /tmp/tmpvu5q022p
ERROR:obs-service-go_modules:File go.mod not found under /tmp/tmpvu5q022p/certgen
Aborting: service call failed:  /usr/lib/obs/service/go_modules --basename certgen --subdir ./ --outdir /XXX/certgen/tmphyblrqfd.go_modules.service

The basename was incorrectly detected as certgen/.github, but even with setting the basename and the subdir it still fails.

  <service name="go_modules" mode="manual">
    <param name="basename">certgen</param>
    <param name="subdir">./</param>
  </service>

[johanneskastl]

Hmmm, seems like the basename_from_archive function looks for only directories within the tarball. And it only finds one: .github.

If I change the order, in which the functions are being called, then the basename detection seems to work:

            args.basename                                                                                                                   
            or basename_from_archive_name(archive)                                                                                          
            or basename_from_archive(archive)                                                                                               
        )

[johanneskastl]

The changes from #51 seem to do the trick in this case, at least it then leads to #52... :-)

(Manually setting the basename also works, but the service should be smart enough IMHO)