Automate redeployments with GitHub Actions

[justb4]

Changes to the pygeoapi GitHub repo are automatically propagated via DockerHub and a DockerHub listener here.

But changes to the demo.pygeoapi.io repo like config or data changes here are not auto-deployed.
Manual action via Ansible is required like:

ansible-playbook -vv deploy.yml -i hosts/demo.pygeoapi.io --tags update,pygeoapi_master etc

Also one needs SSH access.

To have full CI deployment GitHub Actions need to be developed such that anyone with commit rights to the demo repo here can redeploy a service.

Hint: there are quite some GH Actions Ansible modules available, the commands are simple enough, SSH-keying may be the biggest challenge, docs:

• https://misfra.me/2019/10/using-ansible-with-github-actions/ - seems simplest solution
• extensive article on Medium

[justb4]

To add, we apply this (remote deployment via GH Actions calling Ansible) for the Geonovum OGC API testbed:
for example: https://github.com/Geonovum/ogc-api-testbed/blob/main/.github/workflows/deploy.pygeoapi.yml . We can take some ideas from there.

[justb4]

This is a duplicate of #36, will merge/close that one.

[justb4]

Some info From #36, may be redundant:

The current setup to maintain and deploy the various services is semi-automated: Ansible is used, but with full GitOps, coupling GitHub, GH Workflows with Ansible, we get several advantages:

• as pygeoapi Docker builds are moved to GH Workflows, will be easier to integrate (now HTTP-callback from DockerHub)
• any other service like the "Home" page will be automagically deployed on GH push
• repo is well-prepared to later move to OSGeo SAC infrastructure

As example of a fully fledged GitOps pygeoapi deployment the Geonovum OGC API Testbed project can serve as example:

• https://apitestdocs.geonovum.nl/
• https://github.com/Geonovum/ogc-api-testbed