add workflows for release chart

[hongzhen-ma]

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

What type of this PR

• Features
  add workflows for release chart #2642

Which issue(s) this PR fixes:

Fixes #2354

WHAT

🤖 Generated by Copilot at 9710ad9

This pull request adds a GitHub workflow to automatically release Helm charts for the kube-ovn project. It also disables the chart signing feature in the cr.yaml file.

🤖 Generated by Copilot at 9710ad9

chart-releaser-action
Publishes Helm charts to site
No signing in spring

HOW

🤖 Generated by Copilot at 9710ad9

• Add a GitHub workflow to release Helm charts (link)
• Disable chart signing for chart-releaser-action (link)

[github-actions]

• The commit message should provide more context about the changes made in the patch.
• It is recommended to add a description of what this workflow does and how it works.
• The permissions field is empty, which might cause issues with the workflow. It is recommended to remove it or add appropriate permissions.
• The runs-on field can be optimized for better performance based on the requirements of the workflow.
• The fetch-depth field can be increased to improve the speed of the checkout process.
• The Configure Git step might fail if the $GITHUB_ACTOR variable is not set. It is recommended to add a check for this variable before running the command.
• The Install Helm step might take a long time to complete, which can affect the overall performance of the workflow. It is recommended to cache the Helm installation to improve the speed of subsequent runs.
• The chart-releaser-action version used in the workflow can be updated to the latest version for bug fixes and new features.
• The sign field in cr.yaml is set to false, which might cause security issues. It is recommended to set it to true if possible.