* chore: always pass `ROARING_ARCH`
Always pass the `ROARING_ARCH` that we would use for our prod builds.
Otherwise this can easily be missed during testing, profiling or build
system changes (e.g. should we ever move aways for our `Dockerfile`).
This feature was introduced with Rust/Cargo 1.56.
* docs: explain env passing
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
Marco Neumann
Raphael Taylor-Davies