Adds minicom and sudo to the docker image
Switches the shebang line to bash to fix a bug in uart_log.sh when
inside the container (-n option to read requires bash)
- Use Debian Bullseye as `base` image.
- Use proper `LABEL` for authors/maintainers.
- Multi-stage builds.
- Download Rust via rustup.
- Combine RUN commands to reduce layers.