Fix latexindent check to use perl command for formatting .tex files as normal command is doing weird PATH things

Author: fschledorn

.github/workflows/build_and_test.yml

@@ -74,7 +74,7 @@ jobs:
       - name: Check formatting of all .tex files
         run: |
           find . -name "*.tex" | while read file; do
-            latexindent "$file" > "$file.formatted"
+            perl $(kpsewhich latexindent.pl) "$file" > "$file.formatted"
             if ! diff -q "$file" "$file.formatted" > /dev/null; then
               echo "::error file=$file::File is not properly formatted. Run 'make format' locally."
               exit 1