message: ci: forces groupadd to do not fail when group already exists
diff: @@ -20,5 +20,5 @@ mkdir -p "${ENVOY_DOCKER_BUILD_DIR}"
  # Since we specify an explicit hash, docker-run will pull from the remote repo if missing.
  docker run --rm -t -i -u "${USER}":"${USER_GROUP}" -v "${ENVOY_DOCKER_BUILD_DIR}":/build \
  -v "$PWD":/source -e NUM_CPUS --cap-add SYS_PTRACE "${IMAGE_NAME}":"${IMAGE_ID}" \
  - /bin/bash -lc "groupadd --gid $(id -g) envoygroup && useradd --uid $(id -u) --gid $(id -g) \
  + /bin/bash -lc "groupadd --gid $(id -g) -f envoygroup && useradd --uid $(id -u) --gid $(id -g) \
  --no-create-home --home-dir /source envoybuild && su envoybuild -c \"cd source && $*\""
  