deployd: mention case sensitivity for unknown fields

Author: tronghn

pkg/deployd/deployd/deployd_test.go

@@ -157,7 +157,7 @@ var tests = []testSpec{
 		timeout: 2 * time.Second,
 		endStatus: &pb.DeploymentStatus{
 			State:   pb.DeploymentState_failure,
-			Message: "nais.io/v1alpha1, Kind=Application, Namespace=aura, Name=myapplication-unknown-fields: creating resource: strict decoding error:\n| ⚠️ unknown field \"spec.nestedField\"\n| ⚠️ unknown field \"spec.unknownField\"\n| The fields might be misspelled, incorrectly indented, or unsupported.\n| Please verify your resource against the reference documentation at https://doc.nais.io/nais-application/application/ (total of 1 errors)",
+			Message: "nais.io/v1alpha1, Kind=Application, Namespace=aura, Name=myapplication-unknown-fields: creating resource: strict decoding error:\n| ⚠️ unknown field \"spec.nestedField\"\n| ⚠️ unknown field \"spec.unknownField\"\n| The fields might be misspelled, incorrectly indented, or unsupported. Fields are case sensitive.\n| Please verify your resource against the reference documentation at https://doc.nais.io/nais-application/application/ (total of 1 errors)",
 		},
 		deployedResources: nil,
 	},
@@ -168,7 +168,7 @@ var tests = []testSpec{
 		timeout: 2 * time.Second,
 		endStatus: &pb.DeploymentStatus{
 			State:   pb.DeploymentState_failure,
-			Message: "nais.io/v1alpha1, Kind=Application, Namespace=aura, Name=myapplication: updating resource: strict decoding error:\n| ⚠️ unknown field \"spec.nestedField\"\n| ⚠️ unknown field \"spec.unknownField\"\n| The fields might be misspelled, incorrectly indented, or unsupported.\n| Please verify your resource against the reference documentation at https://doc.nais.io/nais-application/application/ (total of 1 errors)",
+			Message: "nais.io/v1alpha1, Kind=Application, Namespace=aura, Name=myapplication: updating resource: strict decoding error:\n| ⚠️ unknown field \"spec.nestedField\"\n| ⚠️ unknown field \"spec.unknownField\"\n| The fields might be misspelled, incorrectly indented, or unsupported. Fields are case sensitive.\n| Please verify your resource against the reference documentation at https://doc.nais.io/nais-application/application/ (total of 1 errors)",
 		},
 		deployedResources: nil,
 	},

pkg/deployd/strategy/deploy.go

@@ -94,7 +94,7 @@ func transformStrictDecodingError(resource unstructured.Unstructured, err error)
 	if len(errs) > 1 {
 		s.WriteString("s")
 	}
-	s.WriteString(" might be misspelled, incorrectly indented, or unsupported.")
+	s.WriteString(" might be misspelled, incorrectly indented, or unsupported. Fields are case sensitive.")
 
 	s.WriteString("\n| Please verify your resource against the reference documentation")
 	if u, ok := docs[resource.GroupVersionKind().String()]; ok {