The rational for removing the toolchain file is that it forces 2 different containers to use the same toolchain version, and these containers (rust-ci and builder-bolos) might not always be in sync.
Since these containers are being used also in other projects it doesn't make sense to enforce a specific version on all our projects.
From here on the rust version will be what is available in the container when the CI is run, which will be part of the CI logs as the version will be shown.
The rational for removing the toolchain file is that it forces 2 different containers to use the same toolchain version, and these containers (rust-ci and builder-bolos) might not always be in sync.
Since these containers are being used also in other projects it doesn't make sense to enforce a specific version on all our projects.
From here on the rust version will be what is available in the container when the CI is run, which will be part of the CI logs as the version will be shown.