fix: allow progress to next client key if unmatched

moul#453

pkg/bastion/ssh.go

@@ -384,6 +384,6 @@ func PublicKeyAuthHandler(db *gorm.DB, logsLocation, aclCheckCmd, aesKey, dbDriv
 		// fallback
 		actx.err = errors.New("unknown ssh key")
 		actx.user = dbmodels.User{Name: "Anonymous"}
-		return true
+		return false
 	}
 }