nds: add validation for tls_skip_verify

.changelog/18333.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+services: Add validation message when `tls_skip_verify` is set to `true` on a Nomad service
+```

nomad/structs/services.go

@@ -388,6 +388,11 @@ func (sc *ServiceCheck) validateNomad() error {
 		return fmt.Errorf("tls_server_name may only be set for Consul service checks")
 	}
 
+	// tls_skip_verify is consul only
+	if sc.TLSSkipVerify {
+		return fmt.Errorf("tls_skip_verify may only be set for Consul service checks")
+	}
+
 	return nil
 }
 

nomad/structs/services_test.go

@@ -1811,6 +1811,21 @@ func TestService_Validate(t *testing.T) {
 			},
 			expErr: true,
 		},
+		{
+			name: "provider nomad with tls skip verify",
+			input: &Service{
+				Name:     "testservice",
+				Provider: "nomad",
+				Checks: []*ServiceCheck{
+					{
+						Name:          "servicecheck",
+						Type:          "http",
+						TLSSkipVerify: true,
+					},
+				},
+			},
+			expErr: true,
+		},
 		{
 			name: "provider nomad with connect",
 			input: &Service{