chore: import upstream snapshot with attribution

apps/sim/triggers/circleback/webhook.ts

@@ -0,0 +1,73 @@
+import { CirclebackIcon } from '@/components/icons'
+import type { TriggerConfig } from '@/triggers/types'
+import { buildMeetingOutputs, circlebackSetupInstructions, circlebackTriggerOptions } from './utils'
+
+export const circlebackWebhookTrigger: TriggerConfig = {
+  id: 'circleback_webhook',
+  name: 'Circleback Webhook',
+  provider: 'circleback',
+  description: 'Generic webhook trigger for all Circleback events',
+  version: '1.0.0',
+  icon: CirclebackIcon,
+
+  subBlocks: [
+    {
+      id: 'selectedTriggerId',
+      title: 'Trigger Type',
+      type: 'dropdown',
+      mode: 'trigger',
+      options: circlebackTriggerOptions,
+      value: () => 'circleback_webhook',
+      required: true,
+    },
+    {
+      id: 'webhookUrlDisplay',
+      title: 'Webhook URL',
+      type: 'short-input',
+      readOnly: true,
+      showCopyButton: true,
+      useWebhookUrl: true,
+      placeholder: 'Webhook URL will be generated',
+      mode: 'trigger',
+      condition: {
+        field: 'selectedTriggerId',
+        value: 'circleback_webhook',
+      },
+    },
+    {
+      id: 'webhookSecret',
+      title: 'Signing Secret',
+      type: 'short-input',
+      placeholder: 'Paste signing secret from Circleback (optional)',
+      description: 'Validates that webhook deliveries originate from Circleback using HMAC-SHA256.',
+      password: true,
+      required: false,
+      mode: 'trigger',
+      condition: {
+        field: 'selectedTriggerId',
+        value: 'circleback_webhook',
+      },
+    },
+    {
+      id: 'triggerInstructions',
+      title: 'Setup Instructions',
+      hideFromPreview: true,
+      type: 'text',
+      defaultValue: circlebackSetupInstructions('All events'),
+      mode: 'trigger',
+      condition: {
+        field: 'selectedTriggerId',
+        value: 'circleback_webhook',
+      },
+    },
+  ],
+
+  outputs: buildMeetingOutputs(),
+
+  webhook: {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+    },
+  },
+}