Updates to ci/gha

[lm-ydubler]

This PR includes updates to various files in the gha branch in order to convert the incubator to GHA & get it up and running.

[cognifloyd]

OK. Since tilde expansion isn't happening like I thought, so maybe we can do this instead:

Suggested change

	VIRTUALENV_DIR: "~/virtualenv"
	VIRTUALENV_DIR: ${{ env.HOME }}/virtualenv

To do that, we need to add a step at the beginning of the job like this:

- name: add HOME to env context
  shell: bash
  run: echo ::set-env name=HOME::$HOME

[cognifloyd]

I just pushed this into change to the upstream gha branch.

[cognifloyd]

It turns out, github already exposes action_path as an env var, so we can remove ACTION_PATH from the env block and just use $GITHUB_ACTION_PATH

Suggested change

	cp ${{env.ACTION_PATH}}/../../.circle/Makefile .
	cp ${GITHUB_ACTION_PATH}/../../.circle/Makefile .

[cognifloyd]

I just pushed this to the upstream gha branch

[cognifloyd]

@lm-ydubler I just consolidated a bunch of the changes into the gha branch. Could you merge that into your gha branch to reduce the diff?

[arm4b]

Thanks, folks for the work you're doing 👍

To connect the dots, just left some notes on the Proposal: Use Github Actions for StackStorm-Exchange CI and Maintenance #63 which is relevant to this PR.

[cognifloyd]

OK. The build_and_test workflow is good to go on the gha branch. I'm going to close this PR now. We'll open up another PR for any collaboration on the deploy workflow, and then one final PR to merge the gha branch into master.