$ docker run --rm --name validator-giflib-usage-giflib-tools-gifbuild-trailer-byte-2536 -t --mount type=bind,src=/tmp/validator-status-giflib-usage-giflib-tools-gifbuild-trailer-byte,dst=/validator/status validator-giflib-shared bash -lc 'set -euo pipefail
/validator/tests/_shared/install_override_debs.sh
exec /validator/tests/_shared/run_library_tests.sh "$@"' validator-testcase giflib usage-giflib-tools-gifbuild-trailer-byte -- bash -c 'PS4=$1; shift; set -x; source "$@"' validator-xtrace '__VALIDATOR_XTRACE__ ' /validator/tests/giflib/tests/cases/usage/usage-giflib-tools-gifbuild-trailer-byte.sh
no override packages found; continuing with apt originals
import sys
with open(sys.argv[1], "rb") as fh:
    data = fh.read()
sys.stdout.write(f"{data[-1]:02x}")
' /tmp/validator-tmp/rebuilt.gif