Feature: Add per-runner “Disable/Pause” (#36776)

This PR adds per-runner disable/enable support for Gitea Actions so a
registered runner can be paused from picking up new jobs without
unregistering.

Disabled runners stay registered and online but are excluded from new
task assignment; running tasks are allowed to finish. Re-enabling
restores pickup, and runner list/get responses now expose disabled
state.

Also added an endpoint for testing
http://localhost:3000/devtest/runner-edit/enable

<img width="1509" height="701" alt="Bildschirmfoto 2026-02-27 um 22 13
24"
src="https://github.com/user-attachments/assets/5328eda9-e59c-46b6-b398-f436e50ee3da"
/>


Fixes: https://github.com/go-gitea/gitea/issues/36767

routers/web/shared/actions/runners.go

@@ -321,6 +321,47 @@ func RunnerDeletePost(ctx *context.Context) {
 	ctx.JSONRedirect(successRedirectTo)
 }
 
+func RunnerUpdatePost(ctx *context.Context) {
+	rCtx, err := getRunnersCtx(ctx)
+	if err != nil {
+		ctx.ServerError("getRunnersCtx", err)
+		return
+	}
+
+	runner := findActionsRunner(ctx, rCtx)
+	if ctx.Written() {
+		return
+	}
+
+	if !runner.EditableInContext(rCtx.OwnerID, rCtx.RepoID) {
+		ctx.NotFound(util.NewPermissionDeniedErrorf("no permission to edit this runner"))
+		return
+	}
+
+	isDisabled := ctx.FormOptionalBool("disabled")
+	if !isDisabled.Has() {
+		ctx.HTTPError(http.StatusBadRequest, "missing 'disabled' parameter")
+		return
+	}
+
+	successKey := "actions.runners.enable_runner_success"
+	failedKey := "actions.runners.enable_runner_failed"
+	if isDisabled.Value() {
+		successKey = "actions.runners.disable_runner_success"
+		failedKey = "actions.runners.disable_runner_failed"
+	}
+
+	if err := actions_model.SetRunnerDisabled(ctx, runner, isDisabled.Value()); err != nil {
+		log.Warn("RunnerUpdatePost.SetRunnerDisabled failed: %v, url: %s", err, ctx.Req.URL)
+		ctx.Flash.Error(ctx.Tr(failedKey))
+		ctx.JSONRedirect("")
+		return
+	}
+
+	ctx.Flash.Success(ctx.Tr(successKey))
+	ctx.JSONRedirect("")
+}
+
 func RedirectToDefaultSetting(ctx *context.Context) {
 	ctx.Redirect(ctx.Repo.RepoLink + "/settings/actions/runners")
 }