fix: Add Attachment endpoint to save file against automation rule (#4480)

Co-authored-by: fayazara <fayazara@gmail.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/api/automation.js

@@ -9,6 +9,14 @@ class AutomationsAPI extends ApiClient {
   clone(automationId) {
     return axios.post(`${this.url}/${automationId}/clone`);
   }
+
+  attachment(file) {
+    return axios.post(`${this.url}/attach_file`, file, {
+      headers: {
+        'Content-Type': 'multipart/form-data',
+      },
+    });
+  }
 }
 
 export default new AutomationsAPI();