Fix kernel permission error#78
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This fixes the Docker build for Biome. Since the Docker build (via docker compose) now builds off
devbranch not a pinned beaker-kernel version, the build was broken by Beaker server upgrades.The beaker-kernel
devbranch added awrite_connection_fileoverride that chowns kernel connection files to the agent user, but since the server was running as root, those files landed in/root/.local/share/jupyter/runtime/— a directory non-root users can't traverse regardless of file permissions. AddingUSER jupyterbeforeCMDensures the server writes connection files to/jupyter/.local/(already owned by UID 1000), resolving the repeatedPermissionErrorthat caused kernels to exhaust their restart attempts and die on startup.