.dockerignore is not work in devcontainers/ci

[LianwMS]

I tried to run azd up for https://github.com/Azure-Samples/azure-search-openai-javascript in devcontainers/ci
.dockerignore is in the root folder. But it will return

ERROR: failed deploying service 'indexer': archive/tar: write too long

Wil not repo in other env..