fix(docker): chown /app workdir so Chainlit can write .files#6
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WORKDIR /app creates the directory as root before COPY runs, and COPY --chown only sets ownership on the files it copies — not on the pre-existing parent. At startup Chainlit calls FILES_DIRECTORY.mkdir(exist_ok=True) which expands to /app/.files and fails with PermissionError because /app is still root-owned when we drop to the `app` user. Adds an explicit `chown app:app /app` after the COPY, before USER switches. Verified by reading the failing log on Fly: PermissionError: [Errno 13] Permission denied: '/app/.files'
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Summary
First Fly deploy crashed at startup with:
WORKDIR /appcreates the directory as root beforeCOPYruns;COPY --chown=app:apponly sets ownership on files it copies, not on the pre-existing parent dir. At startup Chainlit callsFILES_DIRECTORY.mkdir(exist_ok=True)(resolves to/app/.files) which fails because the workdir is still root-owned when we drop to theappuser.Fix: explicit
chown app:app /appafter the COPY, beforeUSERswitches.Test plan
uv run ruff check ./format --check— passes (Dockerfile only)