Define and add CI e.g. GitHub workflows

[freephile]

This is a big epic - because although we can and should add multiple GitHub Actions (aka workflows) to incorporate various CI/CD tooling, we need to address the more fundamental aspect of virtualization in the project. The Vagrant and Docker-based deployment has not been maintained upstream, leaving us with a VM-based approach that is also deficient without a provisioning system like Terraform or CloudFormation.

Reference other workflows / CI

1. SemanticCompoundQueries was updated
2. Professional Wiki's WikibaseRDF example (I think it was cited by Jeroen)
3. Modernize CI pull request for SemanticScribunto (by Paladox)
4. Pandoc CI https://github.com/freephile/pandoc/actions/workflows/ci.yml

[freephile]

most likely use https://github.com/gesinn-it-pub/docker-compose-ci

[freephile]

also add submodule update if needed https://gist.github.com/freephile/7b6dc80557806781ad3abd86fc88e48a

[freephile]

also add dependabot weekly scan

[freephile]

✅ implemented a Yaml Lint action