1. First create a dockerfile, using the below reference

2. From the command prompt, you must run the below command.

For the first time, you must need to login into the registry

docker login registry.gitlab.com -u <user> -p <password>

Now build the dockerfile

docker build -t image:latest .

For pushing the image into registry

docker push registry.gitlab.com/registryrepo/image:latest

3. Now if you want to create docker containers from the image, run the below

docker run image:latest