v1.2.3

• Added ninja
• Added meson

v1.2.2

• Fixed incorrect environment variable settings.

v1.2.1

Identical to v1.2.0, except that this version is published to both DockerHub and GitHub Container Registry (GHCR).

v1.2.0

• Renamed buildkite-agent user to build-agent.
• Changed the default shell to bash.

v1.1.0

• explicitly add ca-cert pkg install

v1.0.2

• Rebuild image to get updated ca-certificates to allow downloads from various sites to work again.

Update to support arm64 image

github: Use docker buildx to create arm64 and amd64 docker images

Tweak the build.yml and publish.yml workflows to create both arm64 and
amd64 docker images.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

Create initial release of Zephyr SDK Build container

Initial release of Zephyr SDK build container that can build sdk-ng on an ubuntu 18.04 base.