[OPTIONAL] make one single Dockerhub repo, and make it private

[ebrvc]

• make one single dockerHub repository
• push images with their respective tags (such as production or staging tag)
• make the repository secret
• adjust the workflow file to pull and push from the right repository
• adjust the docker compose file to pull from the right repository

source: https://docs.docker.com/docker-hub/repos/create/#:~:text=A%20single%20Docker%20Hub%20repository,with%20the%20docker%20push%20command.