fix(volumes): remove per_container and add external

Author: lgaticaq

templates/redis/0/docker-compose.yml.tpl

@@ -89,15 +89,15 @@ services:
 volumes:
   {{- if .Values.REDIS_VOLUME_NAME}}
   {{.Values.REDIS_VOLUME_NAME}}:
-    per_container: true
+    external: true
     {{- if .Values.STORAGE_DRIVER}}
     driver: {{.Values.STORAGE_DRIVER}}
     {{- end}}
   {{- end}}
 
   {{- if .Values.SENTINEL_VOLUME_NAME}}
   {{.Values.SENTINEL_VOLUME_NAME}}:
-    per_container: true
+    external: true
     {{- if .Values.STORAGE_DRIVER}}
     driver: {{.Values.STORAGE_DRIVER}}
     {{- end}}