To publish the docker container images to github container registry we need to get personal access token from developer seeting.
To get personal access token Github profile -> developern setting -> select the classic option -> select delete and write permission then copy the PAT somewhere as it will be used as a password for docker login.
In the project main branch login to the docker using docker login --username githubusername --password PAT ghrc.io
Then next step is to build the docker image using docker build . -t ghrc.io/githubusername/yourimage:latest
Check the image using docker image ls
Push the docker image to the github container registry using docker push ghcr.io/githubusername/yourimage:latest
Add the github action workflow