Adjust ssl_certificate_arn usage in alb

Author: burmek

comet-infrastructure/terraform.tfvars

@@ -15,12 +15,14 @@ availability_zones    = ["us-east-1a", "us-east-1b", "us-east-1c"]
 comet_public_subnets  = ["subnet-012345abcdefghijkl", "subnet-012345abcdefghijkl", "subnet-012345abcdefghijkl"]
 comet_private_subnets = ["subnet-012345abcdefghijkl", "subnet-012345abcdefghijkl", "subnet-012345abcdefghijkl"]
 
+# if provisioning comet_ec2_alb, specify the following for the HTTPS listener
+#ssl_certificate_arn = ""
+
 # if provisioning comet_elasticache for use with existing compute, set the variable below to specify an SG that connections will be allowed from
 elasticache_allow_from_sg = "sg-012345abcdefghijkl"
 
 # if provisioning comet_rds for use with existing compute, set the variable below to specify an SG that connections will be allowed from
 rds_allow_from_sg = "sg-012345abcdefghijkl"
 
 s3_bucket_name      = "comet-use2-bucket"
-rds_root_password   = "CHANGE-ME"
-ssl_certificate_arn = ""
+rds_root_password   = "CHANGE-ME"

comet-infrastructure/variables.tf

@@ -122,7 +122,7 @@ variable "comet_ec2_key" {
 variable "ssl_certificate_arn" {
   description = "ARN of the ACM certificate to use for the ALB"
   type        = string
-  default     = ""
+  default     = null
 }
 
 #comet_eks