Add support for database schema in PostgreSQL (#8819)

* Add support for database schema

* Require setting search_path for the db user

* Add schema setting to admin/config.tmpl

* Use a schema different from default for psql tests

* Update postgres scripts to use custom schema

* Update to xorm/core 0.7.3 and xorm/xorm c37aff9b3a

* Fix migration test

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/auth/user_form.go

@@ -25,6 +25,7 @@ type InstallForm struct {
 	SSLMode  string
 	Charset  string `binding:"Required;In(utf8,utf8mb4)"`
 	DbPath   string
+	DbSchema string
 
 	AppName      string `binding:"Required" locale:"install.app_name"`
 	RepoRootPath string `binding:"Required"`