Since we started creating dedicated lintian environments, the sbuild work requests created by the sbuild workflow tend to fail e.g. https://debusine.freexian.com/freexian/elts/work-request/9062/. The workflow template does not define the sbuild environment. The sbuild workflow https://debusine.freexian.com/freexian/elts/work-request/9063/ has `target_distribution: freexian:stretch`, which looks reasonable. Moving to the created sbuild work requests https://debusine.freexian.com/freexian/elts/work-request/9064/, the environment is selected as `freexian/match:codename=stretch`. This will also match lintian environments and is what ends up being used. The lintian environments on `debusine.f.c` are unsuitable for building as they lack the `apt` package. How can we match the sbuild environments in a more useful way?