solana/ci/docker-rust-nightly

Docker image containing rust nightly and some preinstalled crates used in CI.

This image may be manually updated by running CI=true ./build.sh if you are a member of the Solana Labs Docker Hub organization, but it is also automatically updated periodically by this automation.

Moving to a newer nightly

We pin the version of nightly (see the ARG nightly=xyz line in `Dockerfile) to avoid the build breaking at unexpected times, as occasionally nightly will introduce breaking changes.

To update the pinned version:

1. Locally update the ARG nightly=xyz line in ci/docker-rust-nightly/Dockerfile
2. Run ci/docker-rust-nightly/build.sh to rebuild the nightly image locally
3. Run ci/docker-run.sh --nopull solanalabs/rust-nightly ci/test-nightly.sh to confirm the new nightly image builds. Fix any issues as needed
4. Run CI=true ci/docker-rust-nightly/build.sh to push the new nightly image to dockerhub.com. Note that all CI may be broken now until the next step is completed.
5. Merge the update to ARG nightly=xyz and any codebase adjustments needed.