Add CI support

[khronokernel]

As discussed with @rickheil, this PR is to make releases for SimpleMDMpy easier by building and uploading the wheel automatically through GitHub Actions.

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This PR however does require an admin within MacAdmins to create a new PyPI token and set it as a secret for this repository (MACADMINS_PYPI_PASSWORD). Otherwise automatic uploads will fail for PyPI.

I would recommend setting the secret specific to this repository instead of the normal organization, as to avoid potential abuse outside of it.

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References:

• How can I use API tokens to authenticate with PyPI?
• Using secrets in GitHub Actions