Add direct workflow trigger

Signed-off-by: Andrea Mazzotti <[email protected]>

.github/workflows/populate-channels.yaml

@@ -1,6 +1,7 @@
 name: Populate Channels
 on:
-  schedule:
+  - workflow_dispatch:
+  - schedule:
     - cron: '*/1 * * * *'
 
 env: