Integrate code checks into CI

[Lestropie]

• pylint for linting
• black for code formatting

[Lestropie]

black should ideally also be a pre-commit hook.

[Lestropie]

black pre-commit hook and CI checks are included in #15.

pylint is not yet imposed as a CI check as there is a lot of code documentation to add.

[Lestropie]

Also add hadolint for Dockerfile.