problem with building of the conda package

[eriktamsen]

the building of the conda package fails, looks like a problem with the test environment.
I am currently trying to build without testing buy commenting out the test command, not sure yet if this workaround works for now.
Long term this is not a solution and needs to be fixed.

[srosenbu]

I don't know why mambabuild still tries to execute pytest tests (see https://github.com/BAMresearch/FenicsXConcrete/actions/runs/6035730805/job/16376659091). I removed everything for the tests in the meta.yaml and still it tries to run the tests...

[srosenbu]

So apparently, all of our debugging on the meta.yaml and publish_conda.yaml did nothing because we did not select the right branch for the release...
Curently the upload works but:

1. without tests during the build
2. with conda-build instead of mambabuild