[CI] Set lang to utf8 variant

lierdakil · lierdakil · commit 1680eac953ce · 2025-03-22T15:35:17.000+03:00
Stuff crashes on unicode input, might as well set it to see if it helps.
diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
@@ -4,6 +4,7 @@ on: [push]
 
 env:
   PANDOC_VERSION: "3.6.4"
+  LANG: en_US.utf8
 
 jobs:
   build:
