#!/bin/sh
set -eu

: "${BACKEND_UPSTREAM:?BACKEND_UPSTREAM is required (example: http://analytical-panel-backend:8000)}"

BACKEND_UPSTREAM="${BACKEND_UPSTREAM%/}"
export BACKEND_UPSTREAM

envsubst '${BACKEND_UPSTREAM}' \
  < /etc/nginx/templates/default.conf.template \
  > /etc/nginx/conf.d/default.conf

exec "$@"