fix: support providing null port for creating firewall to support USE_SERVING_PORT (#488)

Author: q2w

modules/backend/main.tf

@@ -286,6 +286,6 @@ resource "google_compute_firewall" "default-hc" {
 
   allow {
     protocol = "tcp"
-    ports    = [var.health_check.port]
+    ports    = var.health_check.port != null ? [var.health_check.port] : null
   }
 }

modules/backend/metadata.display.yaml

@@ -70,6 +70,7 @@ spec:
         host_path_mappings:
           name: host_path_mappings
           title: Host Path Mappings
+          level: 1
         iap_config:
           name: iap_config
           title: Iap Config
@@ -85,6 +86,8 @@ spec:
         name:
           name: name
           title: Name
+          regexValidation: ^[a-z][a-z0-9-]{0,40}[a-z0-9]$
+          validation: Use lowercase letters, numbers, and hyphens. Start with a letter and end with letter/number. Must be 42 characters or fewer.
         outlier_detection:
           name: outlier_detection
           title: Outlier Detection

modules/frontend/metadata.display.yaml

@@ -82,6 +82,8 @@ spec:
         name:
           name: name
           title: Name
+          regexValidation: ^[a-z][a-z0-9-]{0,34}[a-z0-9]$
+          validation: Use lowercase letters, numbers, and hyphens. Start with a letter and end with letter/number. Must be 36 characters or fewer.
         network:
           name: network
           title: Network