Fix accidental substitution

Author: dem4ron

.github/workflows/tests.yml

@@ -88,8 +88,8 @@ jobs:
 
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@master
-        # env: 
-        #   SHELLCHECK_OPTS= --shell=bash --external-sources=true --exclude=SC2001 --norc
+        env: 
+          SHELLCHECK_OPTS: --shell=bash --external-sources=true --exclude=SC2001 --norc
 
   compilation:
     name: Check compilation