This ensures that meson flags defined in src/nix/package.nix are
respected in the dev shell.

Also respect the DETSYS_IDS_TELEMETRY environment variable.

…ngContext

Backward compatibility hack for getFlake applied to unsafeDiscardStringContext

This is more consistent with e.g. hash mismatches in fixed-output
derivations and the output of `nix path-info`.

LocalStore::addToStore(): Show hash mismatches in SRI format

 Upload crash info to Sentry

…vation

The hook gets the path of the derivation as an argument, but the
derivation typically doesn't exist when called as a remote build.

Scalability bottlenecks currently cause diminishing returns above
this. It also prevents creating huge numbers of threads on machines
with lots of cores.

boost::thread_resource_error improvements

getLegacyGitAccessor(): Don't ignore errors

Provide the pre-build hook with a JSON serialization of the derivation