The applier container image & documentation should support projects that manage the applier version dependency with ansible galaxy

[etsauer]

[oybed]

@etsauer just to outline a few more details from our discussion (and please correct anything that's inaccurate):

• The idea is that the container image supports defaults that will look for the requirements.yml and inventory laid out in the following structure:

-my-project
|-inventory
| |-hosts
| |-group_vars/....
|-requirements.yml

• In addition, the image should support env variables to override the requirements file location as well as inventory location