Using full repo name to avoid short-name error in podman

[oilbeater]

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Bug fixes

Which issue(s) this PR fixes:

Fixes #2730

WHAT

🤖 Generated by Copilot at 98b5bec

Use official docker hub registry for kube-ovn images. Update charts/values.yaml to reflect the new registry address.

🤖 Generated by Copilot at 98b5bec

kubeovn address
changed to docker.io
pull images with ease

HOW

🤖 Generated by Copilot at 98b5bec

• Change the global registry address to use the official docker hub repository (link). This allows users to pull the images without having to configure a local registry or mirror, and resolves issue release: prepare for 1.8 #1012.

[github-actions]

• Priority 1: Update the registry address in charts/values.yaml and dist/images/install.sh to "docker.io/kubeovn" instead of "kubeovn". This is important because it ensures that the correct image is pulled from the correct registry, which can prevent issues with image versioning and compatibility.

• Priority 2: Consider adding imagePullSecrets to the global section in charts/values.yaml. This can improve security by allowing for private registry authentication.

• Priority 3: Review the use of hard-coded values such as VERSION and IMAGE_PULL_POLICY in dist/images/install.sh. These values may need to be updated or made configurable to ensure compatibility with different environments.

• Priority 4: Consider adding validation checks to ensure that required variables are set before running dist/images/install.sh. This can help prevent errors and improve user experience.

• Priority 5: Review the use of CNI_CONF_DIR and CNI_BIN_DIR in dist/images/install.sh. These values may need to be updated or made configurable to ensure compatibility with different Kubernetes distributions.