Show instances?

[vreuter]

Is your feature request related to a problem? Please describe.
For tinkering around with some of the types defined here, it could be useful to have a basic Show instance. In particular, Arg given its simplicity, and DockerTaskConfig, given that it aggregates Text and Arg values, seem not too tricky to define instances for.

Describe the solution you'd like
Data.Text already has Show, so we could use that directly or perhaps wrap up, something like Arg ( ++ show a ++ ), then map that or something simple for args field of DockerTaskConfig since args :: [Arg]

Describe alternatives you've considered
N/A

Additional context
N/A

[jeicher]

I feel like this could be low-hanging fruit for me as a first issue.