add action to auto-deploy to PyPI

[pz-max]

Add .git actions to auto deploy after the version tag is changing. Examples:

• PyPSA: https://github.com/PyPSA/PyPSA/blob/master/.github/workflows/deploy.yml
• Atlite: https://github.com/PyPSA/atlite/blob/master/.github/workflows/deploy.yml

[pz-max]

Release process is described here for PyPI: https://github.com/pypsa-meets-earth/earth-osm/blob/main/CONTRIBUTING.md#making-a-new-release