Add healthcheck to JupyterLab module

[blink-so]

Adds /api/status healthcheck to the JupyterLab module to prevent the app from showing as ready before JupyterLab server is fully started and responding.

Changes

• Added healthcheck block to coder_app resource
• Uses JupyterLab's built-in /api/status endpoint
• 5-second interval with 6 successful checks required (30 seconds total)
• Handles both subdomain true and false cases

Testing

Use this module in your template:

module "jupyterlab" {
  source   = "git::https://github.com/coder/registry.git//registry/coder/modules/jupyterlab?ref=blink/jupyterlab-healthcheck"
  agent_id = coder_agent.main.id
}

Fixes #345

[matifali]

Suggested a few things. Also snippet should be as in how to use the module a copy pastable block with source set to the correct git path and branch.

[matifali]

Remove the comment.

[matifali]

This should handle both subdomain true and false case.