GitHub Actions migration

[mattwthompson]

I shamelessly copied the script @jaimergp wrote for the toolkit and trimmed it down to this

[mattwthompson]

Strange, the pip install wasn't able to remove the conda install (openforcefields was installed as an openforcefield dependency), even though I'm pretty sure that's precisely how it worked with Travis

[mattwthompson]

Badges for this PR:

Badge for master after this PR (should be broken now):

[mattwthompson]

@jaimergp please look this over and see if I broke anything :)

[jaimergp]

Hi @mattwthompson, would you mind if we use this PR to try that GH Action that Daniel Smith suggested? I am adding that to MolSSI/cookiecutter-cms#95 as well, so it might be a nice "real word" check while we are at it, if you don't mind :) Shouldn't be much of a change:

• We need to add the action, which would replace the env setup:

    - name: Setup Conda Environment
      uses: goanpeca/setup-miniconda@v1
      with:
         activate-environment: test
         environment-file: devtools/conda-envs/test_env.yaml
         auto-activate-base: false

• Replace later shell: bash lines with shell: bash -l {0}

[jaimergp]

Wow, that was... unexpectedly great!

[dotsdl]

LGTM! Great work y'all! it's a very clean implementation. 😁

[mattwthompson]

Thanks @jaimergp @dotsdl