The `codespell` tool will be run during the "lints" phase of `test.sh`.
See `.codespell.ignore.txt for ignored words. Note that these ignored
words should be listed one per-line, in **lowercase** form.
The boulder-tools `build.sh` script is updated to include `codespell` in
the tools image. I built and pushed new images with this script that are
ref'd by `docker-compose.yml`.
Resolves#4635
Daniel McCarney