fix(devcontainer): chown workspace directory

for some reason, the default `.data` mount is not owned by the `vscode` user (on my system at least), so we `chown` it to ensure that `uv run redbot-setup` can write to the directory.

.devcontainer/devcontainer.json

@@ -30,6 +30,6 @@
     "PROJECT_DIR": "/workspaces/SeaCogs"
   },
   "mounts": ["source=seacogs-persistent-data,target=/workspaces/SeaCogs/.data,type=volume"],
-  "postCreateCommand": "uv sync --frozen",
+  "postCreateCommand": "uv sync --frozen && sudo chown -R vscode:vscode /workspaces/SeaCogs/.data",
   "remoteUser": "vscode"
 }