Fix validation for Kubernetes keys (#257)

The existing regex validates DNS names.

Author: Robert-Stam

gen/go/qdrant/cloud/common/v1/common.pb.go

@@ -127,8 +127,8 @@ message SecretKeyRef {
 message KeyValue {
   // The key part of a key-value pair
   string key = 1 [(buf.validate.field).string = {
-    max_len: 63
-    pattern: "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])$"
+    max_len: 253
+    pattern: "^([a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*/)?[a-z0-9]([-a-z0-9]*[a-z0-9])?$"
   }];
   // The value part of a key-value pair
   string value = 2 [(buf.validate.field).string = {max_len: 1024}];