feat(proxy): add configurable client_max_body_size for HTML and upload locations

This commit introduces a unified mechanism to configure client_max_body_size
for both HTML and upload locations in the sys-svc-proxy role. The directive
is now injected early in html.conf.j2 and moved to a dedicated block in
upload.conf.j2 to ensure consistent behavior for large file uploads such as
OpenProject attachments.

Additionally:
- Added client_max_body_size variable override from web-app-openproject (set to 30m).
- Reordered header includes to avoid duplicate injection.
- Improved comments and structure for better clarity.

Reference: https://chatgpt.com/share/691d873e-9b50-800f-ae70-baf8bf1e5454

roles/sys-svc-proxy/templates/location/html.conf.j2

@@ -5,10 +5,17 @@ location {{location}}
     {% include 'roles/web-app-oauth2-proxy/templates/following_directives.conf.j2'%}
   {% endif %}
 
+  {% include 'roles/sys-svc-proxy/templates/headers/content_security_policy.conf.j2' %}
+
+  {% include 'roles/sys-svc-proxy/templates/headers/access_control_allow.conf.j2' %}
+
+  # Client Limits for HTML
+  client_max_body_size {{ client_max_body_size | default('100m') }};
+
   {% set _loc = location|trim %}
   proxy_pass http://127.0.0.1:{{ http_port }}{{ (_loc|regex_replace('^(?:=|\\^~)\\s*','')) if not (_loc is match('^(@|~)')) else '' }};
 
-  # headers
+  # Proxyconfiguration for Upload
   proxy_set_header Host $host;
   proxy_set_header Authorization $http_authorization;
   proxy_set_header X-Real-IP $remote_addr;
@@ -18,16 +25,12 @@ location {{location}}
   proxy_set_header X-Forwarded-Ssl on;
   proxy_pass_request_headers on;
 
-  {% include 'roles/sys-svc-proxy/templates/headers/content_security_policy.conf.j2' %}
-
-  {% include 'roles/sys-svc-proxy/templates/headers/access_control_allow.conf.j2' %}
-
   # WebSocket specific header
   proxy_http_version 1.1;
   proxy_set_header Upgrade $http_upgrade;
   proxy_set_header Connection "upgrade";
 
-  # timeouts
+  # Timeouts
   proxy_connect_timeout     5s;
   proxy_send_timeout        900s;
   proxy_read_timeout        900s;

roles/sys-svc-proxy/templates/location/upload.conf.j2

@@ -1,13 +1,17 @@
 location {{ location_upload }} {
+    
+    # Proxyconfiguration for Upload
     proxy_pass              http://127.0.0.1:{{ http_port }};
     proxy_set_header        Host              $host;
     proxy_set_header        X-Real-IP         $remote_addr;
     proxy_set_header        X-Forwarded-For   $proxy_add_x_forwarded_for;
     proxy_set_header        X-Forwarded-Proto $scheme;
-    client_max_body_size    {{ client_max_body_size }};
     proxy_buffering         off;
     proxy_request_buffering off;
     proxy_read_timeout      120s;
     proxy_connect_timeout   120s;
     proxy_send_timeout      120s;
+
+    # Client Limits for Upload
+    client_max_body_size    {{ client_max_body_size }};
 }

roles/web-app-openproject/tasks/main.yml

@@ -2,6 +2,8 @@
 - name: "load docker, db and proxy for {{ application_id }}"
   include_role:
     name: sys-stk-full-stateful
+  vars:
+    client_max_body_size: "30m"
 
 - name: "Create {{ OPENPROJECT_PLUGINS_FOLDER }}"
   file: