Try quoting the filename

Author: peternewman

.github/workflows/test.yml

@@ -15,4 +15,4 @@ jobs:
     - name: Check sort with disorder
       run: sort -c test/test.txt || true
     - name: Check sort with disorder in an unusually named file
-      run: sort -c test/test:2.txt || true
+      run: sort -c "test/test:2.txt" || true