Support for custom cmdArgs to enable log rotation for envoy access log

[izturn]

Our team recently encountered an issue where access logs in Envoy containers were expanding rapidly.

The envoy team recommends using logrotate to manage log size. However, we noticed that the cmd & args for envoy containers generated by the contour provisioner are currently hardcoded, as follows:

Command: []string{
	"envoy",
},
Args: []string{
	"-c",
	filepath.Join("/", envoyCfgVolMntDir, envoyCfgFileName),
	fmt.Sprintf("--service-cluster $(%s)", envoyNsEnvVar),
	fmt.Sprintf("--service-node $(%s)", envoyPodEnvVar),
	fmt.Sprintf("--log-level %s", contour.Spec.EnvoyLogLevel),
	fmt.Sprintf("--base-id %d", contour.Spec.EnvoyBaseID),
},

limiting the ability to configure logrotate.

To address this, we modified the code to allow custom them.

I’d like to ask if others have faced similar issues, and if so, what solutions were implemented?

Would it be helpful if we submitted a PR for this change?