Devcontainer does not run `postCreateCommand` for some users

We've noticed this with a couple of users, I have noticed it on my laptop but not my Diamond workstation. The expected flow is:
1. Container builds
2. Displays a message saying build is complete
3. Runs `postCreateCommand` and begins installing dependencies etc.
4. Displays a message saying devcontainer is ready and that the user should press any key to continue

The observed symptoms are vscode getting stuck at step 2. reloading the window usually gets it unstuck and it executes step 3. and 4. more investigation is needed

首先重現所回報的 devcontainer 流程，並檢查 build-complete 訊息和 postCreateCommand 附近的 VS Code 生命週期或容器記錄。完成的標準是，在受影響的環境中，容器能可靠地執行 postCreateCommand 並到達就緒訊息，而不需要重新載入視窗。

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