Support large uploads via Skyline

A new override, `skyline_client_max_body_size`, has been introduced to
support large image uploads via the Skyline dashboard. The default value
of 1100M supports upstream Ubuntu and Rocky Linux images, but can be
increased to support larger images or decreased to encourage the use
of the CLI.

Change-Id: I0fc079692980ccd24edabcea5382ff6ada693893

defaults/main.yml

@@ -109,3 +109,6 @@ skyline_services:
 ## Tunable overrides
 skyline_apiserver_init_overrides: {}
 skyline_skyline_yaml_overrides: {}
+
+# Set override for image upload size
+skyline_client_max_body_size: 1100M

releasenotes/notes/support-large-image-uploads.yaml-1ac278e2a2cbb846.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    A new override, `skyline_client_max_body_size`, has been introduced to
+    support large image uploads via the Skyline dashboard. The default value
+    of 1100M supports upstream Ubuntu and Rocky Linux images, but can be
+    increased to support larger images or decreased to encourage the use
+    of the CLI.

templates/nginx.conf.j2

@@ -46,6 +46,9 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_set_header X-Forwarded-Host $host;
         proxy_set_header Host $http_host;
+{%   if 'glance' in _service %}
+        client_max_body_size {{ skyline_client_max_body_size }};
+{%  endif %}
     }
 {%  endif %}
 {% endfor %}