fix(release): package Core migration runtime

src/govoplan_core/db/migrations.py

@@ -7,6 +7,7 @@ import logging
 import os
 from pathlib import Path
 import re
+import sysconfig
 from typing import Any
 
 from alembic import command
@@ -462,11 +463,13 @@ def _jsonable_migration_task_details(value: Mapping[str, Any]) -> Mapping[str, A
 
 def _repo_root() -> Path:
     packaged_root = Path(__file__).resolve().parents[3]
+    installed_runtime_root = Path(sysconfig.get_path("data")) / "govoplan_core_runtime"
     configured = os.environ.get("GOVOPLAN_CORE_SOURCE_ROOT")
     candidates = [
         Path(configured).expanduser() if configured else None,
         Path.cwd(),
         packaged_root,
+        installed_runtime_root,
     ]
     for candidate in candidates:
         if candidate is None: