solana/ci/docker-rust-nightly/README.md

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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](https://hub.docker.com/u/solanalabs/) Docker Hub
organization, but it is also automatically updated periodically by
[this automation](https://buildkite.com/solana-labs/solana-ci-docker-rust-nightly).
## 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. Run `ci/docker-rust-nightly/build.sh` to rebuild the nightly image locally,
or potentially `ci/docker-rust-nightly/build.sh YYYY-MM-DD` if there's a
specific YYYY-MM-DD that is desired (default is today's build).
1. Run `SOLANA_DOCKER_RUN_NOSETUID=1 ci/docker-run.sh --nopull solanalabs/rust-nightly:YYYY-MM-DD ci/test-nightly.sh`
to confirm the new nightly image builds. Fix any issues as needed
1. Run `docker login` to enable pushing images to Docker Hub, if you're authorized.
1. Run `CI=true ci/docker-rust-nightly/build.sh YYYY-MM-DD` to push the new nightly image to dockerhub.com.
1. Modify the `solanalabs/rust-nightly:YYYY-MM-DD` reference in `ci/buildkite.yml` from the previous to
new *YYYY-MM-DD* value, send a PR with this change and any codebase adjustments needed.
## Troubleshooting
### Resource is denied
When running `CI=true ci/docker-rust-nightly/build.sh`, you see:
```
denied: requested access to the resource is denied
```
Run `docker login` to enable pushing images to Docker Hub. Contact @mvines or @garious
to get write access.