feat(argo-rollouts): restart when configmap changes

[DerekTBrown]

Context

Resolves #3118

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• My build is green (troubleshooting builds).

[yu-croco]

We want to align to other argoproj's checksum, and I don't think we need comments for this. :)
e.g.) https://github.com/argoproj/argo-helm/blob/main/charts/argo-cd/templates/argocd-application-controller/deployment.yaml#L24

[yu-croco]

Hi @DerekTBrown , thank you for your PR.
Though you checked below on your PR description, I don't think you handle it. Please handle it.

I have updated the chart changelog with all the changes that come with this pull request according to changelog.

[yu-croco]

now I just wonder that the deployment of argo-rollouts doesn't refer configmap, how is the configmap related to deployment...? Do we need to restart as following configmap's change?🤔
https://github.com/argoproj/argo-rollouts/blob/master/manifests/base/argo-rollouts-deployment.yaml

[DerekTBrown]

now I just wonder that the deployment of argo-rollouts doesn't refer configmap, how is the configmap related to deployment...? Do we need to restart as following configmap's change?🤔 https://github.com/argoproj/argo-rollouts/blob/master/manifests/base/argo-rollouts-deployment.yaml

I think there are potentially many config options that require a restart to take effect.

To provide one example, plugins are configured via the ConfigMap and are downloaded on startup.¹ If the user changes the ConfigMap to include or modify the plugin file or URL, they would expect the service to restart to pull in this change.

Footnotes

1. https://argo-rollouts.readthedocs.io/en/stable/plugins/#plugin-name ↩