pre-commit: add hook to ensure Makefiles are indented with tabs

Manual hook added which runs a shell script.

Can be run locally manually by Linux or Mac users and we have this also running on the GitHub Actions CI.

Will fail if Makefiles uses spaces for indentation.

Can run the manual hooks with:

`pre-commit run check-makefile-indentation --all-files --hook-stage manual`

scripts/check_makefiles_for_tabs.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Iterate over all files passed as arguments by pre-commit
+for makefile in "$@"; do
+  # Check if the file exists and is a regular file
+  if [[ -f "$makefile" ]]; then
+    if grep -P '^\s' "$makefile" | grep -vP '^\t' > /dev/null; then
+      echo "Error: File '$makefile' contains spaces at the beginning of lines instead of tabs."
+      exit 1
+    fi
+  fi
+done
+exit 0