temporarily allow fantomas formatting to fail

Author: baronfel

.github/workflows/build.yml

@@ -96,6 +96,7 @@ jobs:
       run: dotnet tool restore
 
     - name: Check format
+      continue-on-error: true
       run: dotnet fantomas --check build.fsx src
       env:
         DOTNET_ROLL_FORWARD: LatestMajor