build: tag version commit with version tag

[tristanls]

This pull request introduces a tag_version_monty_publish job to the Monty Publish workflow.

The job is only triggered when Monty workflow on the main branch succeeds, which is after a commit is merged to main.

  tag_version_monty_publish:
    name: tag-version-monty-publish
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    ...

The version is tagged only when that commit contains a version change in src/tbp/monty/__init__.py.

      ...
      - name: Tag version
        if: ${{ steps.version_updated.outputs.version_updated == 'true' }}
        working-directory: tbp.monty
        run: |
          git tag v${{ steps.version_updated.outputs.version }}
          git push origin v${{ steps.version_updated.outputs.version }}

The Version updated action now additionally returns version from src/tbp/monty/__init__.py (in addition to currently returning the version_updated boolean). This version is used in the tag name. For example, if the version is 0.0.7 then the tag will be v0.0.7

There are fewer if: conditionals in this job because it only triggers on the conclusion of Monty workflow and will not run on the manual trigger.

[codeallthethingz]

LGTM. One comment around the use of the print_version tool.

[codeallthethingz]

you could use the tools/print_version command here instead.

[tristanls]

Yes, I considered it. I believe that in order to use the print_version tool, I need to create the conda environment, install the tool, and invoke it. Is that correct?

[codeallthethingz]

Yes. Though you don't have install anything.

[tristanls]

Yes. Though you don't have install anything.

What do you mean?

When I run the tool without installing via python -m tools.print_version.cli -h I get an error:

(tbp.monty) me@not_invented_here tbp.monty % python -m tools.print_version.cli -h 
Traceback (most recent call last):
  File "/opt/anaconda3/envs/tbp.monty/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/opt/anaconda3/envs/tbp.monty/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/Users/me/tbp/tbp.monty/tools/print_version/cli.py", line 15, in <module>
    import semver
ModuleNotFoundError: No module named 'semver'

[tristanls]

I'm going to merge this as is for now and we can revisit in the future.