set back to main

Author: SKairinos

.github/workflows/main.yaml

@@ -7,5 +7,5 @@ on:
 
 jobs:
   main:
-    uses: ocadotechnology/codeforlife-workspace/.github/workflows/backend.yaml@backend_template
+    uses: ocadotechnology/codeforlife-workspace/.github/workflows/backend.yaml@main
     secrets: inherit