Merge pull request #1428 from bestparents/feat/mattermost-channel

feat: add Mattermost channel support

src/infra/outbound/deliver.ts

@@ -28,11 +28,18 @@ type SendMatrixMessage = (
   opts?: { mediaUrl?: string; replyToId?: string; threadId?: string; timeoutMs?: number },
 ) => Promise<{ messageId: string; roomId: string }>;
 
+type SendMattermostMessage = (
+  to: string,
+  text: string,
+  opts?: { accountId?: string; mediaUrl?: string; replyToId?: string },
+) => Promise<{ messageId: string; channelId: string }>;
+
 export type OutboundSendDeps = {
   sendWhatsApp?: typeof sendMessageWhatsApp;
   sendTelegram?: typeof sendMessageTelegram;
   sendDiscord?: typeof sendMessageDiscord;
   sendSlack?: typeof sendMessageSlack;
+  sendMattermost?: SendMattermostMessage;
   sendSignal?: typeof sendMessageSignal;
   sendIMessage?: typeof sendMessageIMessage;
   sendMatrix?: SendMatrixMessage;