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Case A: Cloudflare access (This is what you probably want)

If you want to protect your subdomains with Cloudflare Access, you can add them to the cloudflare_access_applications list in the variables.auto.tfvars file. For example, imagine that using Coolify you’ve deployed a service that is running on the subdomain htop.yourdomain.com. You can add this subdomain to the cloudflare_access_applications list to protect it with Cloudflare Access.
  1. Update the variables.auto.tfvars file with the new subdomain to protect.
cloudflare_access_applications = [
  { name = "Access application for monitoring", domain = "htop" }, // add this
  #...
]
  1. Run the installer go run selfhoster.go --apply in the root of the project.

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Case B: Tunneling to services running directly on the instance

Update the variables.auto.tfvars file with the new subdomain you want to add. Example: Add a new subdomain htop to your domain.
  1. Update the variables.auto.tfvars file with the new subdomain.
This is how ssh works internally 
# The map of record to service running in the instance
cloudflare_records = [
  { name = "ssh", service = "http://<private_instance_ip>:22" },
  { name = "ping", service = "http://<private_instance_ip>:8080" }, # something running on the instance
  #...
]
## The domains that should request your email for access
cloudflare_access_applications = [
  { name = "Access application for monitoring", domain = "ssh" },
  { name = "Access application for ping", domain = "ping" }, # something you want to protect
  #...
]
  1. Run the installer go run selfhoster.go --apply in the root of the project.
You should be able to access the new subdomain at the following URL: https://htop.yourdomain.com