701 workflow improve webhook triggers (#11455)

as title

Nota bene: I did not filter execution by http method. A POST webhook
trigger can be triggered by a GET request for more flexibility. Tell me
if you think it is a mistake


https://github.com/user-attachments/assets/1833cbea-51a8-4772-bcd8-088d6a087e79

packages/twenty-front/src/modules/workflow/validation-schemas/workflowSchema.ts

@@ -209,9 +209,19 @@ export const workflowCronTriggerSchema = baseTriggerSchema.extend({
 
 export const workflowWebhookTriggerSchema = baseTriggerSchema.extend({
   type: z.literal('WEBHOOK'),
-  settings: z.object({
-    outputSchema: z.object({}).passthrough(),
-  }),
+  settings: z.discriminatedUnion('httpMethod', [
+    z.object({
+      outputSchema: z.object({}).passthrough(),
+      httpMethod: z.literal('GET'),
+      authentication: z.literal('API_KEY').nullable(),
+    }),
+    z.object({
+      outputSchema: z.object({}).passthrough(),
+      httpMethod: z.literal('POST'),
+      expectedBody: z.object({}).passthrough(),
+      authentication: z.literal('API_KEY').nullable(),
+    }),
+  ]),
 });
 
 // Combined trigger schema