Feat: Allow different shell for post

[hummeltech]

Description

Sometimes it can be helpful to use a different shell for the post action, this adds in support for that.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[tarampampam]

Could you update the readme file too?

[hummeltech]

Sure thing, good idea! I was thinking about doing that this morning too.

[tarampampam]

Thank you very much! Could you please describe a situation where you may need to override the post-action shell?

[hummeltech]

Sure, here are a few situations.

• If you are using Windows, you might want to use PowerShell for the post command(s) and Bash for the run command(s).
• If there is something that cannot be done with Bash for the run command(s), but you do want to use it for the post command(s), you could use Python for the run command(s)
  • Maybe you want to check that a database migration has completed (I.E. check if a table exists in the database)
• If you are using a custom Docker image that has multiple shells that you want to test

[jetexe]

Thanks for your contribution!
There is one interesting moment

[hummeltech]

No problem, thanks for the suggestions

[tarampampam]

LGTM @jetexe

[jetexe]

Thanks for PR!

[jetexe]

Released