Set setting.AppURL as GITEA_ROOT_URL environment variable during pushes (#12752)

* Set setting.AppURL as GITEA_ROOT_URL environment variable during pushes

Fix #11738

Signed-off-by: Andrew Thornton <art27@cantab.net>

routers/repo/http.go

@@ -268,6 +268,7 @@ func HTTP(ctx *context.Context) {
 			models.EnvPusherName + "=" + authUser.Name,
 			models.EnvPusherID + fmt.Sprintf("=%d", authUser.ID),
 			models.EnvIsDeployKey + "=false",
+			models.EnvAppURL + "=" + setting.AppURL,
 		}
 
 		if !authUser.KeepEmailPrivate {