Allow to choose shell in .gitlab-ci.yml

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Problem to solve

Only the default shell can be used for your script.

Intended users

Developers.

Further details

Sometimes you want to use a more advanced shell for more advanced scripts, such as Fish or Plumbum.

Proposal

I can think of 2 options:

1. Add a script_shell key (and possibly before_script_shell and after_script_shell).

2. If a script starts with a shebang, use that:

   myjob:
     script:
       - echo normal script
       - |
         #!/usr/bin/python
         print("special script")

Permissions and Security

N/A

Documentation

It should be added to https://docs.gitlab.com/ce/ci/yaml/

Testing

Add a test using a separate shell.

What does success look like, and how can we measure that?

Success would be if the feature works... I guess 🤔.

Links / references