Base docker image for services
- https://medium.com/swlh/using-github-actions-to-build-arm-based-docker-images-413a8d498ee
- https://help.github.com/en/actions/configuring-and-managing-workflows/creating-and-storing-encrypted-secrets
- https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions
- https://help.github.com/en/actions/reference/events-that-trigger-workflows
- https://github.com/crazy-max/ghaction-docker-buildx
- https://github.com/actions/cache
- https://stackoverflow.com/questions/22287872/pipe-output-to-environment-variable-export-command
- https://git-scm.com/book/en/v2/Git-Basics-Viewing-the-Commit-History