Support set different image registry server

[Rick]

This project publishes images to the following container registries:

• docker.io
• ghcr.io

And, the following is kind of the proxy image address. So linuxsuren.docker.scarf.sh is an available container registry as well.

linuxsuren.docker.scarf.sh/linuxsuren/api-testing

You could add it to the following section

api-testing/helm/api-testing/values.yaml

Line 7 in dd7cd46

 image: 

Expect

Users could use the following flags to choose different container registry:

helm install atest oci://docker.io/linuxsuren/api-testing \
    --version image.registry=ghcr.io

[JustinWang]

Hi @LinuxSuRen
Let me try, assigned to me.

[Rick]

Images exist on the registry.aliyuncs.com as well. The image path is: registry.aliyuncs.com/linuxsuren/api-testing:master