Publish a buildctl-only image

[Lukas-solar]

I would really like to use an ultra slim OCI image with buildkit that is only about 30 MB in size. I use a remote buildkit daemon in a central location, so I only need the buildctl cli. How about something like this?

FROM docker.io/library/bash:latest
ARG TARGETARCH
RUN wget -q "https://github.com/moby/buildkit/releases/download/v0.23.2/buildkit-v0.23.2.linux-$TARGETARCH.tar.gz" --output-document=- | \
	tar --gz --extract --directory=/usr/local bin/buildctl && \
	chmod 555 /usr/local/bin/buildctl
RUN mkdir -p /home/buildkit/.docker/ && echo '{}' > /home/buildkit/.docker/config.json && chown 1000:1000 /home/buildkit -R
ENV HOME=/home/buildkit
USER 1000:1000

(Code from https://github.com/kokuwaio/buildctl/blob/main/Dockerfile)