Added instance-level variables (#28115)

This PR adds instance-level variables, and so closes #27726



![gitea_instance_variables_1](https://github.com/go-gitea/gitea/assets/8344487/ad409cd4-ce36-4c84-a764-34451b0fb63a)

![gitea_instance_variables_2](https://github.com/go-gitea/gitea/assets/8344487/426f0965-dec6-4560-948c-067cdeddd720)

![gitea_instance_variables_3](https://github.com/go-gitea/gitea/assets/8344487/cf1d7776-4938-4825-922e-cbbbf28a5f33)

1 files changed, 4 insertions, 1 deletions

diff --git a/templates/admin/navbar.tmpl b/templates/admin/navbar.tmpl
index 8ece95239c..b22db1d1fc 100644
--- a/templates/admin/navbar.tmpl
+++ b/templates/admin/navbar.tmpl
@@ -60,12 +60,15 @@
 			{{end}}
 		{{end}}
 		{{if .EnableActions}}
-		<details class="item toggleable-item" {{if .PageIsSharedSettingsRunners}}open{{end}}>
+		<details class="item toggleable-item" {{if or .PageIsSharedSettingsRunners .PageIsSharedSettingsVariables}}open{{end}}>
 			<summary>{{ctx.Locale.Tr "actions.actions"}}</summary>
 			<div class="menu">
 				<a class="{{if .PageIsSharedSettingsRunners}}active {{end}}item" href="{{AppSubUrl}}/admin/actions/runners">
 					{{ctx.Locale.Tr "actions.runners"}}
 				</a>
+				<a class="{{if .PageIsSharedSettingsVariables}}active {{end}}item" href="{{AppSubUrl}}/admin/actions/variables">
+					{{ctx.Locale.Tr "actions.variables"}}
+				</a>
 			</div>
 		</details>
 		{{end}}