✨ Add Linear Trigger node (#2767)

* ✨ Linear Trigger

* 🎨 Replace PNG with SVG icon

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

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

@@ -0,0 +1,18 @@
+import {
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class LinearApi implements ICredentialType {
+	name = 'linearApi';
+	displayName = 'Linear API';
+	documentationUrl = 'linear';
+	properties: INodeProperties[] = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string',
+			default: '',
+		},
+	];
+}