fix sdist build: use build hook to bundle config files (#803)

* fix sdist build: use build hook to bundle config files

* copy hatch_build.py in Dockerfile

cli/hatch_build.py

@@ -0,0 +1,44 @@
+"""Hatch build hook to bundle config files from the repo into the package.
+
+Single source of truth stays in ../config/. This hook copies them into
+planoai/data/ so they end up inside both the sdist and wheel.
+"""
+
+import os
+import shutil
+
+from hatchling.builders.hooks.plugin.interface import BuildHookInterface
+
+FILES = {
+    "plano_config_schema.yaml": "plano_config_schema.yaml",
+    "envoy.template.yaml": "envoy.template.yaml",
+}
+
+
+class CustomBuildHook(BuildHookInterface):
+    def initialize(self, version, build_data):
+        root = os.path.dirname(__file__)
+        # Repo checkout: ../config/  |  sdist: config/
+        candidates = [
+            os.path.join(root, "..", "config"),
+            os.path.join(root, "config"),
+        ]
+        dest_dir = os.path.join(root, "planoai", "data")
+        os.makedirs(dest_dir, exist_ok=True)
+
+        for src_name, dest_name in FILES.items():
+            dest = os.path.join(dest_dir, dest_name)
+            copied = False
+            for cand in candidates:
+                src = os.path.join(cand, src_name)
+                if os.path.exists(src):
+                    shutil.copy2(src, dest)
+                    copied = True
+                    break
+            if not copied and not os.path.exists(dest):
+                raise FileNotFoundError(
+                    f"Config file {src_name} not found. "
+                    "Build from the repo root or ensure files are present."
+                )
+
+        build_data["force_include"][dest_dir] = "planoai/data"