Use GITHUB_TOKEN per coveralls 3.3.1 help

[jombr]

Getting the following error

Running on Github Actions but GITHUB_TOKEN is not set.
Add "env: GITHUB_TOEKN: ${{ secrets.GITHUB_TOKEN }}" to
your step config.

Following directions from latest coveralls python (3.3.1) help
for Github Actions
https://coveralls-python.readthedocs.io/en/latest/usage/configuration.html#github-actions-support

[coveralls]

coverage: 88.963%. remained the same
when pulling 42ea74f on josephbredahl:coveralls-token-crash
into c70fbc1 on djc:main.

[jombr]

@djc this seems to be the right or most popular answer. Let me know if you are OK with swapping using COVERALLS_REPO_TOKEN with the GITHUB_TOKEN.

Otherwise, I'm not really sure why COVERALLS_REPO_TOKEN wasn't working. I expect it should have been brought in via load_config_from_environment.

I couldn't quite verify if setting COVERALLS_REPO_TOKEN within the shell run: | no longer worked. So maybe doing something like...

env:
        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}

... would still work.

...So I just defaulted to do what the coveralls-python help suggested. Figured that was the most safe path forward.

Also, let me know if you do or don't want me to bug you with reviews.