Restore postCreateCommand to set up uv environment

Author: tpoliaw

.devcontainer/devcontainer.json

@@ -48,5 +48,5 @@
     // Mount the parent as /workspaces so we can pip install peers as editable
     "workspaceMount": "source=${localWorkspaceFolder}/..,target=/workspaces,type=bind",
     // After the container is created, install the python project in editable form
-    // "postCreateCommand": "pip install $([ -f dev-requirements.txt ] && echo '-c dev-requirements.txt') -e '.[dev]' && pre-commit install"
+    "postCreateCommand": "uv sync --locked && uvx pre-commit install && SHELL=bash uv tool update-shell"
 }