Conda packaging

[atteggiani]

Added resources for conda packaging.

The umfile_utils package will be released to the accessnri anaconda channel and will be installable with:

conda install accessnri::umfile_utils

This PR includes CI/CD framework to automatically verify, build and upload the umfile_utils package.

[jo-basevi]

Looks great to me! Just a couple insignificant questions - so feel free to resolve

[atteggiani]

@jo-basevi
Thank you for your comments. I addressed them in the specific commits.

I also forgot to add a job for a version sanity check.
I did in 29cbca90652fa640e64f837d2c3ae2978e834463

Would you mind having a look at the PR now in its final state?
Thank you!

[jo-basevi]

Looks good to me - no major comments.

I wonder if it would be useful using the semver command line tool, or similar, for parsing and comparing versions? Could have logic checking if a tag equals one of semver --increment "major" "$new_tag_name" or semver --increment "minor" "$new_tag_name", etc. I think (?) semver $new_tag_name only returns zero if it's a valid version too.

[jo-basevi]

Overall I think the changes looks good to me. I just have another small comment

[jo-basevi]

Thanks @atteggiani, looks good to me!

[atteggiani]

Thank you @jo-basevi for reviewing!
Merged.