- Improve the build of the image by introducing `build.sh`.
It can be used with `podman` or `buildah` and
also provides a way of building a `dev` or `prod`
image for development purposes by
`build.sh [dev|prod]`.
- CI runs this script as well with `buildah`.
Signed-off-by: Gabriel Nützi <gnuetzi@gmail.com>
