debian/rootfs/usr/local/share/template-files/config/env/examples/global.sh

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# GLOBAL enviroment variables
USER="${USER:-root}"
LANG="${LANG:-C.UTF-8}"
TZ="${TZ:-America/New_York}"
ENV_PORTS="${ENV_PORTS//\/*/}"
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# How to set permissions
SERVICE_USER="${SERVICE_USER:-}"
SERVICE_GROUP="${SERVICE_GROUP:-}"
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SERVICE_UID="${SERVICE_UID:-}" # set the user id
SERVICE_GID="${SERVICE_GID:-}" # set the group id