fix: const qualifier for scanner root_directory parameter

.gitignore

@@ -6,3 +6,4 @@ build-asan
 coverage.info
 build-*/
 build3/
+build_docker2/

src/client/scanner.c

@@ -33,7 +33,7 @@ static DirEntry* dir_entry_create(const char* path, int depth) {
   return de;
 }
 
-DirectoryScanner* directory_scanner_create(char* root_directory, bool use_metadata,
+DirectoryScanner* directory_scanner_create(const char* root_directory, bool use_metadata,
                                            unsigned long long chunk_size, char** exclude_patterns,
                                            int exclude_count, char** include_patterns,
                                            int include_count, unsigned long long max_size,

src/client/scanner.h

@@ -22,7 +22,7 @@ typedef struct {
   int current_depth;
 } DirectoryScanner;
 
-DirectoryScanner* directory_scanner_create(char* root_directory, bool use_metadata,
+DirectoryScanner* directory_scanner_create(const char* root_directory, bool use_metadata,
                                            unsigned long long chunk_size, char** exclude_patterns,
                                            int exclude_count, char** include_patterns,
                                            int include_count, unsigned long long max_size,