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, 3 insertions, 0 deletions

diff --git a/templates/admin/actions.tmpl b/templates/admin/actions.tmpl
index 9640e0fd1f..597863d73b 100644
--- a/templates/admin/actions.tmpl
+++ b/templates/admin/actions.tmpl
@@ -3,5 +3,8 @@
 	{{if eq .PageType "runners"}}
 		{{template "shared/actions/runner_list" .}}
 	{{end}}
+	{{if eq .PageType "variables"}}
+		{{template "shared/variables/variable_list" .}}
+	{{end}}
 	</div>
 {{template "admin/layout_footer" .}}