Updating Keycloak example

Applies fixes contributed by dajeffers in
PR 3307 for CrunchyData/postgres-operator.

Issue: [sc-20286]

Author: Anthony Landreth

kustomize/keycloak/keycloak.yaml

@@ -16,6 +16,7 @@ spec:
     spec:
       containers:
       - image: quay.io/keycloak/keycloak:latest
+        args: ["start-dev"]
         name: keycloak
         env:
         - name: DB_VENDOR
@@ -30,19 +31,19 @@ spec:
           valueFrom: { secretKeyRef: { name: keycloakdb-pguser-keycloakdb, key: user } }
         - name: DB_PASSWORD
           valueFrom: { secretKeyRef: { name: keycloakdb-pguser-keycloakdb, key: password } }
-        - name: KEYCLOAK_USER
+        - name: KEYCLOAK_ADMIN
           value: "admin"
-        - name: KEYCLOAK_PASSWORD
+        - name: KEYCLOAK_ADMIN_PASSWORD
           value: "admin"
-        - name: PROXY_ADDRESS_FORWARDING
-          value: "true"
+        - name: KC_PROXY
+          value: "edge"
         ports:
         - name: http
           containerPort: 8080
         - name: https
           containerPort: 8443
         readinessProbe:
           httpGet:
-            path: /auth/realms/master
+            path: /realms/master
             port: 8080
       restartPolicy: Always