Use my Flat fork for now

githubocto/flat#60

Author: dwoffinden

.github/workflows/flat.yml

@@ -19,7 +19,7 @@ jobs:
       - name: update apt
         run: sudo apt-get update
       - name: Fetch data
-        uses: githubocto/flat@v3
+        uses: dwoffinden/flat@46c174833e6cda4da4a94257a83150c207935a99
         with:
           http_url: https://conoroneill.com/index.xml
           downloaded_filename: conor_rss.xml