Add includes configuration key

src/hatch_protobuf/plugin.py

@@ -50,6 +50,9 @@ def initialize(self, version: str, build_data: Dict[str, Any]) -> None:
         for generator in self._generators:
             args.append(f"--{generator.name}_out={generator.output_path}")
 
+        for include in self._includes:
+            args.append(f"-I{include}")
+
         args += [str(p) for p in self._files.inputs]  # cast to str for debug output
 
         self.app.display_debug(f"Running {shlex.join(args)}")
@@ -69,6 +72,10 @@ def clean(self, versions: List[str]) -> None:
     def _root_path(self) -> Path:
         return Path(self.root)
 
+    @cached_property
+    def _includes(self) -> List[str]:
+        return self.config.get("includes", [])
+
     @cached_property
     def _default_proto_path(self) -> str:
         builder = self.build_config.builder