feat: add deployment configuration singleton, tag, documentation (#541)

* feat: add configuration property deployment

* feat: add deployment configuration singleton documentation

Author: doprdele

application/app/views/layouts/application.html.erb

@@ -4,6 +4,7 @@
     <title><%= content_for(:title) || "OnDemand Loop" %></title>
     <meta name="viewport" content="width=device-width,initial-scale=1">
     <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="deployment" content="<%= Configuration.deployment %>">
     <%= csrf_meta_tags %>
     <%= csp_meta_tag %>
 

application/config/configuration_singleton.rb

@@ -34,6 +34,7 @@ def property_configs
       ::ConfigurationProperty.property(:dataverse_hub_url, default: 'https://hub.dataverse.org/api/installations'),
       ::ConfigurationProperty.property(:zenodo_default_url, default: 'https://zenodo.org'),
       ::ConfigurationProperty.property(:logging_root),
+      ::ConfigurationProperty.file_content(:deployment, default: File.join(app_root, 'DEPLOYMENT').to_s),
     ].freeze
   end
 

docs/guide/content/admin/configuration.md

@@ -78,6 +78,7 @@ The following properties control various aspects of OnDemand Loop's behavior. Ea
 - [zenodo_default_url](#zenodo_default_url)
 - [logging_root](#logging_root)
 - [navigation](#navigation)
+- [deployment](#deployment)
 
 ---
 
@@ -252,6 +253,7 @@ URL to the external documentation site. This is used for help links in the inter
 Proxy server settings for outbound HTTP requests made by internal clients (such as the `Common::HttpClient` class). This is used to route API requests through a proxy, which may be required in secure or enterprise network environments.
 
 The value should be a hash with the following optional keys:
+
 - `:host`: proxy server hostname or IP (e.g., `'proxy.example.com'`)
 - `:port`: port number used by the proxy (e.g., `8080`)
 - `:user`: (optional) username for proxy authentication
@@ -342,6 +344,15 @@ For detailed configuration options and examples, see the [Navigation Customizati
 
 ---
 
+<a id="deployment"></a>
+**`deployment`**  
+Specifies the path to a file containing the OnDemand Loop deployment version string. This string is referenced in the Loop meta tag in the header of all Loop pages.
+
+- **Default**: `/var/www/ood/apps/sys/loop/DEPLOYMENT`
+- **Environment Variable**: _Not supported_
+
+---
+
 ### Other Environment Variables
 
 These additional environment variables control application behavior and are typically set at the system level.
@@ -452,4 +463,4 @@ OOD_LOOP_GUIDE_URL=https://example.com/loop
 OOD_LOOP_DATAVERSE_HUB_URL=https://hub.dataverse.org/api/installations
 OOD_LOOP_ZENODO_DEFAULT_URL=https://zenodo.org
 OOD_LOOP_LOGGING_ROOT=/var/log/loop
-```
+```