Add inbucket docker image to allow local and automated testing of emails (#4901)

* add docker container for inbucket

* Add way to get the emails using inbucket and add a test for reset password

* add config setting to send emails

* update TestEmailTest

update

* add another test and fix wrong assert

* update per review

fix lint

change senders email

* Revert config.json to default values for EmailSettings section

* update test

* add setup to make the test run

api/admin_test.go

@@ -160,6 +160,22 @@ func TestRecycleDatabaseConnection(t *testing.T) {
 func TestEmailTest(t *testing.T) {
 	th := Setup().InitBasic().InitSystemAdmin()
 
+	SendEmailNotifications := utils.Cfg.EmailSettings.SendEmailNotifications
+	SMTPServer := utils.Cfg.EmailSettings.SMTPServer
+	SMTPPort := utils.Cfg.EmailSettings.SMTPPort
+	FeedbackEmail := utils.Cfg.EmailSettings.FeedbackEmail
+	defer func() {
+		utils.Cfg.EmailSettings.SendEmailNotifications = SendEmailNotifications
+		utils.Cfg.EmailSettings.SMTPServer = SMTPServer
+		utils.Cfg.EmailSettings.SMTPPort = SMTPPort
+		utils.Cfg.EmailSettings.FeedbackEmail = FeedbackEmail
+	}()
+
+	utils.Cfg.EmailSettings.SendEmailNotifications = false
+	utils.Cfg.EmailSettings.SMTPServer = ""
+	utils.Cfg.EmailSettings.SMTPPort = ""
+	utils.Cfg.EmailSettings.FeedbackEmail = ""
+
 	if _, err := th.BasicClient.TestEmail(utils.Cfg); err == nil {
 		t.Fatal("Shouldn't have permissions")
 	}