Remove Keycloak JDK UseContainerSupport parameter

The parameter `-XX:+UseContainerSupport` is no longer required for Keycloak >= v21 based on JDK v17.
JDK >= v17 has enabled the container support by default.

charts/keycloakx/README.md

@@ -269,14 +269,15 @@ This allows you to only configure memory using Kubernetes resources and the JVM
 extraEnv: |
   - name: JAVA_OPTS
     value: >-
-      -XX:+UseContainerSupport
       -XX:MaxRAMPercentage=50.0
       -Djava.net.preferIPv4Stack=true
       -Djava.awt.headless=true
 ```
 
 Alternatively one can append custom JVM options by setting the `JAVA_OPTS_APPEND` environment variable.
 
+The parameter `-XX:+UseContainerSupport` is no longer required for [Keycloak >= v21 based on JDK v17](https://github.com/keycloak/keycloak/blob/release/21.0/quarkus/container/Dockerfile#L20).
+
 #### Using an External Database
 
 The Keycloak Docker image supports various database types.

charts/keycloakx/ci/h2-values.yaml

@@ -18,7 +18,6 @@ extraEnv: |
         key: password
   - name: JAVA_OPTS_APPEND
     value: >-
-      -XX:+UseContainerSupport
       -XX:MaxRAMPercentage=50.0
       -Djava.awt.headless=true
       -Djgroups.dns.query={{ include "keycloak.fullname" . }}-headless

charts/keycloakx/examples/postgresql-kubeping/keycloak-server-values.yaml

@@ -37,7 +37,6 @@ extraEnv: |
         key: password
   - name: JAVA_OPTS_APPEND
     value: >-
-      -XX:+UseContainerSupport
       -XX:MaxRAMPercentage=50.0
       -Djava.awt.headless=true
       -Dkubeping_namespace={{ .Release.Namespace }}

charts/keycloakx/examples/postgresql/keycloak-server-values.yaml

@@ -25,7 +25,6 @@ extraEnv: |
         key: password
   - name: JAVA_OPTS_APPEND
     value: >-
-      -XX:+UseContainerSupport
       -XX:MaxRAMPercentage=50.0
       -Djava.awt.headless=true
       -Djgroups.dns.query={{ include "keycloak.fullname" . }}-headless