feat: Create send slack message action

packages/backend/src/apps/slack/actions/send-message-to-channel.ts

@@ -0,0 +1,21 @@
+import { WebClient } from '@slack/web-api';
+import { IJSONObject } from '@automatisch/types';
+
+export default class SendMessageToChannel {
+  client: WebClient;
+  parameters: IJSONObject;
+
+  constructor(connectionData: IJSONObject, parameters: IJSONObject) {
+    this.client = new WebClient(connectionData.accessToken as string);
+    this.parameters = parameters;
+  }
+
+  async run() {
+    const result = await this.client.chat.postMessage({
+      channel: this.parameters.channel as string,
+      text: this.parameters.message as string,
+    });
+
+    return result;
+  }
+}