Minor doc improvement: example for extra_args

[akiross]

Hey,

I just started using ansible with podman and I hit a minor hiccup when using extra_args: I needed to use some --build-arg, but for some reason I did not realize extra_args was more general and I just assumed it was precisely expecting a list of variables for --build-arg. So, I tried to do the following:

- name: Build with an argument
  containers.podman.podman_image:
    ...
    build:
      extra_args: "FOO=bar"  # error!

and got a rather cryptic error: Error: accepts at most 1 arg(s), received 2 (the error is clear, but what is causing that is not as clear).
In retrospect, extra_args was obviously meant to be used like:

- name: Build with an argument
  containers.podman.podman_image:
    ...
    build:
      extra_args: "--build-arg FOO=bar"

So, just to avoid someone does the same mistake, I'm proposing to add an example to the documentation showing how to use extra_args, for example by passing --build-arg FOO=bar.

That's it. Thank you for your great work with podman and ansible!

[sshnaidm]

@akiross I'd be happy to merge PR which adds such examples to doc :) Would you like to submit an example?

[akiross]

Sorry for the late reply, but yes, I'd like to contribute; I'll allocate some time this week to work on it!

[akiross]

Created PR #493.