Add GitHub App event security_advisory (#2799)

Fixes: #2798.

Author: lukehinds

github/event.go

@@ -127,6 +127,8 @@ func (e *Event) ParsePayload() (payload interface{}, err error) {
 		payload = &RepositoryVulnerabilityAlertEvent{}
 	case "SecretScanningAlertEvent":
 		payload = &SecretScanningAlertEvent{}
+	case "SecurityAdvisoryEvent":
+		payload = &SecurityAdvisoryEvent{}
 	case "StarEvent":
 		payload = &StarEvent{}
 	case "StatusEvent":

github/messages.go

@@ -93,6 +93,7 @@ var (
 		"repository_vulnerability_alert": "RepositoryVulnerabilityAlertEvent",
 		"release":                        "ReleaseEvent",
 		"secret_scanning_alert":          "SecretScanningAlertEvent",
+		"security_advisory":              "SecurityAdvisoryEvent",
 		"star":                           "StarEvent",
 		"status":                         "StatusEvent",
 		"team":                           "TeamEvent",

github/messages_test.go

@@ -440,6 +440,10 @@ func TestParseWebHook(t *testing.T) {
 			payload:     &SecretScanningAlertEvent{},
 			messageType: "secret_scanning_alert",
 		},
+		{
+			payload:     &SecurityAdvisoryEvent{},
+			messageType: "security_advisory",
+		},
 		{
 			payload:     &StarEvent{},
 			messageType: "star",

github/repos_hooks_deliveries_test.go

@@ -189,6 +189,7 @@ var hookDeliveryPayloadTypeToStruct = map[string]interface{}{
 	"repository_import":              &RepositoryImportEvent{},
 	"repository_vulnerability_alert": &RepositoryVulnerabilityAlertEvent{},
 	"secret_scanning_alert":          &SecretScanningAlertEvent{},
+	"security_advisory":              &SecurityAdvisoryEvent{},
 	"star":                           &StarEvent{},
 	"status":                         &StatusEvent{},
 	"team":                           &TeamEvent{},