push nvmeof images to quay on release/tag create

[barakda]

Related to issue174.

Providing a github action to push nvmeof and nvmeof-cli images to the quay.io registries (only) when creating new github releases or tags.

• github action workflow will run on any new commit (as before) and on a new release/tag add.
• I checked the push part through my quay.io registry, we need to make sure this repo quay login user/password secrets parameters have the correct values for the production registries.

[baum]

@barakda awesome PR! Please sign off the commit, see here, to color DCO check green 🟩.

[epuertat]

I'd also limit this to:

on:
  push:
    tags:
      - 'v*'

Otherwise, any other type of tag name will result in container images being published as well.

[epuertat]

LGTM, with some final remarks!