feat(Rundeck Node): Update credential with test and make useable in HTTP Request node (#3879)

* add support for authenticate, test to RundeckApi Credentials

* ensure that the RunDeckApi note uses the authentication mechanism
defined incredentials

packages/nodes-base/credentials/RundeckApi.credentials.ts

@@ -1,4 +1,9 @@
-import { ICredentialType, INodeProperties } from 'n8n-workflow';
+import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
 
 export class RundeckApi implements ICredentialType {
 	name = 'rundeckApi';
@@ -19,4 +24,22 @@ export class RundeckApi implements ICredentialType {
 			default: '',
 		},
 	];
+	
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'user-agent': 'n8n',
+				'X-Rundeck-Auth-Token': '={{$credentials?.token}}',
+			},
+		},
+	};
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: '={{$credentials.url}}',
+			url: '/api/14/system/info',
+			method: 'GET',
+		},
+	};	
 }