KC_PROXY deprecated, use proxy-headers about charts

[andresbono]

Hi, thank you for reporting this issue. I can reproduce it installing the bitnami/keycloak chart with default values:

$ helm install keycloak oci://registry-1.docker.io/bitnamicharts/keycloak --version 21.3.1
$ kubectl logs statefulset/keycloak

2024-05-27 09:49:32,273 WARN  [org.key.qua.run.cli.Picocli] (main) The following used options or option values are DEPRECATED and will be removed in a future release:
	- proxy: Use proxy-headers.

Although it's just a deprecation warning (for now), we can fix it in the container and chart configuration.

Some references:

• https://www.keycloak.org/server/reverseproxy

The support for setting proxy modes is deprecated and will be removed in a future Keycloak release. Consider configuring accepted reverse proxy headers instead [...]

• https://www.keycloak.org/docs/24.0.4/upgrading/index.html#deprecated-proxy-option

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