ci(compiler): Add option --fix to lint_cpp.sh

Add an option `--fix` to `lint_cpp.sh` advising `clang-tidy` to apply
suggested fixes.

.github/workflows/scripts/lint_cpp.sh

@@ -1,5 +1,16 @@
 #!/bin/bash
 
+print_usage() {
+    local FD=$1
+    echo "Usage: $0 [OPTION]" >&$FD
+    echo "Check if the sources comply with the checks from .clang-tidy" >&$FD
+    echo "" >&$FD
+    echo "Options:" >&$FD
+    echo "  -f, --fix                  Advise clang-tidy to fix any issue" >&$FD
+    echo "                             found." >&$FD
+    echo "  -h, --help                 Print this help." >&$FD
+}
+
 die() {
     echo "$@" >&2
     exit 1
@@ -13,6 +24,28 @@ check_buildfile() {
 	    "directory."
 }
 
+CLANG_TIDY_EXTRA_ARGS=()
+
+# Parse arguments
+while [ $# -gt 0 ]
+do
+    case $1 in
+	-f|--fix)
+	    CLANG_TIDY_EXTRA_ARGS+=("--fix")
+	    ;;
+	-h|--help)
+	  print_usage 1
+	  exit 0
+	  ;;
+	*)
+	  print_usage 2
+	  exit 1
+	  ;;
+    esac
+
+    shift
+done
+
 check_buildfile "CMakeFiles/CMakeDirectoryInformation.cmake"
 check_buildfile "compile_commands.json"
 
@@ -29,4 +62,5 @@ TOP_SRCDIR=$(grep -o 'set\s*(\s*CMAKE_RELATIVE_PATH_TOP_SOURCE\s\+"[^"]\+")' \
 
 find "$TOP_SRCDIR/"{include,lib,src} \
      \( -iname "*.h" -o -iname "*.cpp" -o -iname "*.cc" \) | \
-    xargs clang-tidy -p . -header-filter="$TOP_SRCDIR/include/.*\.h"
+    xargs clang-tidy -p . -header-filter="$TOP_SRCDIR/include/.*\.h" \
+	  "${CLANG_TIDY_EXTRA_ARGS[@]}"