Use ENV to set docker-gen version
Ignore .git and README.md during docker build
Update Dockerfile maintainer and README
[Finishes #81819596]
Merge branch 'feature/81819596_csaturnino_create_dockerfile' into develop

* feature/81819596_csaturnino_create_dockerfile:
  Update Dockerfile maintainer and README [Finishes #81819596]
  Ignore .git and README.md during docker build
  Use ENV to set docker-gen version
Merge branch 'develop'
[skip ci]
* develop:
  Update Dockerfile maintainer and README [Finishes #81819596]
  Ignore .git and README.md during docker build
  Use ENV to set docker-gen version