Add Containerfile for development

[crawfxrd]

Add a command to create a Debian-based container with the coreboot, SDCC, and Rust toolchains installed in order to minimize the workspace setup time and ensure build environments are the same.

make -C containers
podman run -it --rm \
    -v $PWD:/workspace:Z \
    -v ~/.ccache:/root/.cache/ccache:Z \
    system76/firmware-open:latest \
    ./scripts/build.sh oryp8

A locally built image is 2.46 GiB.

Ref: #463

TODO (later)

• Versioning for the container?
• Build from CI and publish somewhere? (publish to/pull from ghcr.io or Docker Hub)
• Simplify using it for local development? (don't require typing the full podman command)
  • Default to using the container, and have an override to build on the host
• Get Jenkins to use it?

[XV-02]

I get an error due to not having a ~/.ccache directory. What do I need to do to remedy that?

[crawfxrd]

Host will still need ccache installed, and it seems to be ~/.cache/ccache on Debian (ccache -p | grep cache_dir).

So the example probably needs to be:

-     -v ~/.ccache:/root/.ccache:Z \
+     -v ~/.cache/ccache:/root/.cache/ccache:Z \

[XV-02]

I've been able to build firmware reliably and flash it using the containerized build several times today. I don't see any reason not to move with this if engineering desires.