fix(backend/kubernetes): Ensure valid naming of name field (#1661)

- Kubernetes v1.26 on VKE causes error when creating persistent volume
claim because of uppercase characters in name field

This patch is trivial just in order to get it working - happy to
implement differently.

The error in question:

```
The PersistentVolumeClaim "wp-01G1131R63FWBSPMA4ZAZTKLE-0-clone-0" is invalid: metadata.name: Invalid value: "wp-01G1131R63FWBSPMA4ZAZTKLE-0-clone-0": a lowercase RFC 1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')
```

pipeline/backend/kubernetes/service.go

@@ -22,9 +22,14 @@ func Service(namespace, name, podName string, ports []string) (*v1.Service, erro
 		})
 	}
 
+	dnsName, err := dnsName(name)
+	if err != nil {
+		return nil, err
+	}
+
 	return &v1.Service{
 		ObjectMeta: metav1.ObjectMeta{
-			Name:      dnsName(name),
+			Name:      dnsName,
 			Namespace: namespace,
 		},
 		Spec: v1.ServiceSpec{