Unable to build with Docker

[zliu-rh]

Not quite sure if this is a ztunnel issue or the builder image issue, but on a freshly cloned repo:

$ make build
cargo build
error: rustup could not choose a version of cargo to run, because one wasn't specified explicitly, and no default is configured.
help: run 'rustup default stable' to download the latest stable release of Rust and set it as your default toolchain.
make[1]: *** [Makefile.core.mk:15: build] Error 1
make: *** [Makefile:44: build] Error 2

similarly spawning a shell into the builder container:

$ make shell
build-tools:/work# rustc
error: rustup could not choose a version of rustc to run, because one wasn't specified explicitly, and no default is configured.
help: run 'rustup default stable' to download the latest stable release of Rust and set it as your default toolchain.

Not sure how the CI/Prow jobs run but it seems they mount the build-cache volume which might have had some one-time setup?

[ilrudie]

Interesting. This works totally fine for me on AMD64 and Linux. What are you using?