fix: fix digest pinning for custom kubernetes image resources

kubernetes.json

@@ -32,6 +32,11 @@
       "description": "Disable kubernetes-api datasource",
       "datasources": ["kubernetes-api"],
       "enabled": false
+    },
+    {
+      "matchDatasources": ["docker"],
+      "matchPaths": ["flux/**/patchCluster.yaml"],
+      "pinDigests": true
     }
   ],
   "regexManagers": [
@@ -40,8 +45,7 @@
       "matchStrings": [
         "\\s+(imageName):\\s+\"?'?(?<depName>[^:\\s]+):(?<currentValue>[^\"'@]+?)(@(?<currentDigest>sha256:[a-f0-9]+))?\"?'?\\s"
       ],
-      "datasourceTemplate": "docker",
-      "pinDigests": true
+      "datasourceTemplate": "docker"
     }
   ]
 }