add keycloak 2 and 3

.env.sample

@@ -72,6 +72,16 @@ RETENTION_MAX_LIFETIME=4w
 
 ## TURN
 
+#COMPOSE_FILE="$COMPOSE_FILE:compose.keycloak3.yml"
+#KEYCLOAK3_ENABLED=1
+#KEYCLOAK3_ID=keycloak3
+#KEYCLOAK3_NAME=
+#KEYCLOAK3_URL=
+#KEYCLOAK3_CLIENT_ID=
+#KEYCLOAK3_CLIENT_DOMAIN=
+#KEYCLOAK3_ALLOW_EXISTING_USERS=false
+#SECRET_KEYCLOAK3_CLIENT_SECRET_VERSION=v1
+
 #COMPOSE_FILE="$COMPOSE_FILE:compose.turn.yml"
 #TURN_ENABLED=1
 #TURN_URIS="[\"turns:coturn.foo.zone?transport=udp\", \"turns:coturn.foo.zone?transport=tcp\"]"