(feature): docker health checks (#12124)

* Add Docker container health checks

* Use invoke tasks for Docker container health checks

Updates server and worker healthchecks to use invoke server-health
and invoke worker-health as requested in #12124 review.

Refs #12124

* Added HTTP host check to server health check

* Add health-check endpoint for Caddyfile

* Simplify health check for Caddy

* Remove test file

---------

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>
Co-authored-by: DESKTOP-691E36A\Administrator <br198064@gmail.com>
Co-authored-by: Matthias Mair <code@mjmair.com>

tasks.py

@@ -1666,15 +1666,33 @@ def server_health(c, address: str = 'http://localhost:8000', timeout: int = 5):
     """Check if the web server is healthy by requesting /api/system/health/.
 
     Exits 0 on HTTP 200, 1 otherwise.
-    No Django startup required.
+    Django startup only required when when INVENTREE_SITE_URL is not set
+    and no docker/devcontainer/pkg-installer env vars are set. Django exceptions
+    caught and logged as warnings, but do not cause the health check to fail.
     """
     import urllib.error
+    import urllib.parse
     import urllib.request
 
+    from src.backend.InvenTree.InvenTree.config import (  # type: ignore[import]
+        get_setting,
+    )
+
     url = f'{address.rstrip("/")}/api/system/health/'
+    site_url = None
 
     try:
-        with urllib.request.urlopen(url, timeout=timeout) as response:
+        site_url = get_setting('INVENTREE_SITE_URL', 'site_url', None)
+    except (Exception, SystemExit) as exc:
+        warning(f'Could not determine configured site URL: {exc}')
+
+    request = urllib.request.Request(url)
+
+    if site_url and (hostname := urllib.parse.urlparse(site_url).hostname):
+        request.add_header('Host', hostname)
+
+    try:
+        with urllib.request.urlopen(request, timeout=timeout) as response:
             if response.status == 200:
                 success(f'Server is healthy ({url})')
                 return