fix(renovate): lookup apache images

renovate.json

@@ -13,7 +13,7 @@
         "^Chart\\.yaml$"
       ],
       "matchStrings": [
-        "appVersion: \"(?<currentValue>.*?)\"\\s+"
+        "appVersion: \"(?<currentValue>.*?)-apache\"\\s+"
       ],
       "datasourceTemplate": "docker",
       "depNameTemplate": "roundcube/roundcubemail",