OSX CI Testing with Github Actions

[ChrisKeefe]

This Draft PR has been opened to attempt to wire up Github Actions-based CI on OSX.

[thermokarst]

Go ahead and re-run the build:

https://github.com/ChrisKeefe/q2-diversity-lib/runs/696852971?check_suite_focus=true#step:4:1954

I forgot to update the tag on action-library-packaging, so your workflow checked out an older build.

[thermokarst]

Huzzah! It worked!

[thermokarst]

What's your plan for getting these changes back in into qiime2#6 ? Many of the errors in the test suite are because of missing data assets (you'll need to add them to package_data (link)).

[ChrisKeefe]

This PR is against bDiv, which is the 'from' branch of qiime2#6. Once tests are passing here, I was planning to squash these commits into that branch and carry on with my work there.

I've never tried to pull a PR into a branch with an open PR before - am I better off doing that on my local with an interactive rebase, then pushing up to bDiv directly?

[thermokarst]

I've never tried to pull a PR into a branch with an open PR before - am I better off doing that on my local with an interactive rebase, then pushing up to bDiv directly?

No, I think its 6 of one, half dozen of the other. I would just merge the PR, personally.

[ChrisKeefe]

Sweet! It looks as though this is working as expected. OSX build is failing (as expected) on the problematic test you caught earlier. I'm going to merge this sucker, remove the Travis config in a separate commit, and dig into that broken test. Thanks for all the support on this, @thermokarst!