Create a script to deploy WMAgent docker image

[amaltaro]

Impact of the new feature
WMAgent

Is your feature request related to a problem? Please describe.
We need to have a set of scripts to deploy and manage the agent packaged in a docker image.

Describe the solution you'd like
A few scripts need to be created for deploying and managing the agent, such as:

• deploy script as already available in CMSKubernetes (or WMCore)
• script to bootstrap the agent (tweak configuration based on secrets) and to populate initial databases
• script to manage the agent (usual stop/start/restart/status actions)

NOTE: it might require further discussion and whenever possible, reuse code already available.

Describe alternatives you've considered
None

Additional context
Depends on: #8797
Part of the following meta issue: #11314

[amaltaro]

This has been addressed with: dmwm/CMSKubernetes#1393
Thanks Todor! Closing this one out.