Fix blank invite email (#17065)

* Fix blank invite email

* Some small improvements

* Another small fix

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/helper_test.go

@@ -530,6 +530,21 @@ func (*TestHelper) GetSqlStore() *sqlstore.SqlStore {
 	return mainHelper.GetSQLStore()
 }
 
+func (th *TestHelper) ConfigureInbucketMail() {
+	inbucket_host := os.Getenv("CI_INBUCKET_HOST")
+	if inbucket_host == "" {
+		inbucket_host = "localhost"
+	}
+	inbucket_port := os.Getenv("CI_INBUCKET_SMTP_PORT")
+	if inbucket_port == "" {
+		inbucket_port = "10025"
+	}
+	th.App.UpdateConfig(func(cfg *model.Config) {
+		*cfg.EmailSettings.SMTPServer = inbucket_host
+		*cfg.EmailSettings.SMTPPort = inbucket_port
+	})
+}
+
 func (*TestHelper) ResetRoleMigration() {
 	sqlStore := mainHelper.GetSQLStore()
 	if _, err := sqlStore.GetMaster().Exec("DELETE from Roles"); err != nil {