An optional job to push to Docker Hub. Copied from the Docker Hub
template.

Build and push an image to Docker Hub. Match the image tag to the
branch.

Include in the templates. Also, for Docker deployments, run the tests
(pre-commit) first and then build the images.

Run almost everything in ns4 (it's the fastest and least used). Don't
set the runner for Docker deployments, allow the project to set the
default.

This reverts commit 5b3aeb85.

Didn't work as expected.

Instead of having just hidden jobs and extending it in the project, use
a variable that can be overriden in the project (not sure it will work).

For real this time.

Don't create new ones in templates.

- ci-fairy pre-commit check.
- Correctly show failing ci-fairy test.

Copied from existing projects.

- bats
- pypi upload
- docker-compose build and run
- gitlab release
- build presentations

Also, some pre-commit checks and a CI for it.