Add a pre-merge job to run pylint

[galv]

Now that we have several people developing, we should start thinking about adding this. I'm not sure how github does this actually. We can also consider adding a pre-commit git hook as well.

More importantly, we should start running unit tests before each merge.

[Ciroye]

We must define the main factors that we must ensure before making a "pull request". Which are the "scripts" or functions in which we should focus tests before accepting any improvement.

I will be investigating unit tests that allow us to ensure the integrity of the project

[Ciroye]

Already implemented Pylint test. The next step implement Bazel in github actions