Switch CI from miniconda to micromamba

[altheaden]

This PR switches CI to use the setup-micromamba GitHub action instead of the setup-miniconda GitHub action, in an effort to fix CI crashes caused by the latest miniconda version.

[altheaden]

@xylar Considering the recent changes to remove sphinx-multiversion, is there anything else we should update in the docs workflow? I imagine we want to remove it from the list of packages to install during the environment setup at least.

[xylar]

@altheaden, I think I did remove sphinx-multiversion:
https://github.com/MPAS-Dev/MPAS-Tools/pull/617/files
Did I miss somewhere?

[xylar]

Oh, I see. yes, it needs to be removed.

[xylar]

This should be updated to match:
https://github.com/MPAS-Dev/MPAS-Tools/blob/master/conda_package/dev-spec.txt#L37-L39

Suggested change

	sphinx sphinx-multiversion mock sphinx_rtd_theme
	sphinx mock sphinx_rtd_theme

[altheaden]

@xylar I think I must have re-introduced it when I was rebasing onto your newest changes. I'll take care of it.

[xylar]

No, I think I just missed it.

[altheaden]

Ah, yeah, I see what happened now. There's a call to it at the very end of the workflow where we build the docs to check for issues. Should I just remove the whole job or replace that call with something else?

MPAS-Tools/.github/workflows/build_workflow.yml

Lines 114 to 120 in 964681c

	- if: ${{ steps.skip_check.outputs.should_skip != 'true' }}
	name: Build Sphinx Docs
	run: |
	# sphinx-multiversion expects at least a "master" branch
	git branch master || echo "branch master already exists."
	cd conda_package/docs
	sphinx-multiversion . _build/html

[xylar]

Oops, I didn't realize which workflow this was. That last docs build command needs to be the same as in the documentation:

cd conda_package/docs
DOCS_VERSION=master make versioned-html

[xylar]

Or maybe we can just make master be test instead, since that seems more truthful.

[altheaden]

@xylar How does this look?

MPAS-Tools/.github/workflows/build_workflow.yml

Lines 114 to 118 in ee60eab

	- if: ${{ steps.skip_check.outputs.should_skip != 'true' }}
	name: Build Sphinx Docs
	run: |
	cd conda_package/docs
	DOCS_VERSION=test make versioned-html

[xylar]

Yes, exactly. That looks good!