Add basic model validator to convert 'mkdir_chmod' string into an int

Author: tieneupin

src/murfey/util/config.py

@@ -153,6 +153,15 @@ def validate_software_versions(cls, v: dict[str, Any]) -> dict[str, str]:
         # Let it validate and fail as-is
         return v
 
+    @field_validator("mkdir_chmod", mode="before")
+    @classmethod
+    def parse_octal_int(cls, value):
+        # Attempt to parse the string as an octal int
+        if isinstance(value, str):
+            return int(value, 8)
+        # Return value as-is otherwise
+        return value
+
 
 @lru_cache(maxsize=1)
 def machine_config_from_file(