Reduce klipper docker image size

[derlaft]

Hi,

There are a couple of issues making klipper image significantly larger than it should be:

Here you can remove .git folder after git checkout. This saves around 80M:

prind/docker/klipper/Dockerfile

Lines 9 to 11 in 82675dd

	RUN git clone ${REPO} klipper \
	&& cd klipper \
	&& git checkout ${VERSION}

Here you can try using COPY --chown instead of a separate COPY and RUN chown. Otherwise all the files are duplicated in a new layer:

prind/docker/klipper/Dockerfile

Lines 23 to 30 in 82675dd

	COPY --from=build /opt/klipper ./klipper
	COPY --from=build /opt/venv ./venv
	RUN mkdir -p printer_data/run printer_data/gcodes printer_data/logs printer_data/config
	RUN groupadd klipper --gid 1000 \
	&& useradd klipper --uid 1000 --gid klipper \
	&& usermod klipper --append --groups dialout \
	&& chown -R klipper:klipper /opt/*

Those two simple changes should result in pull size reduction from ~720M to ~350M (for armv7).

I would have liked to created a platform, but I'm using that to try to run klipper on a machine without docker, so I don't have an easy way to test the changes....

[mkuf]

Hey there,
thanks for reaching out.

I did some local builds on arm64 and could achieve these image sizes with your suggestions, this is really great. 😃

Image	Size before	Size after
klipper	852M	397M
moonraker	328M	269M
ustreamer	112M	98.1M

These changes are Implemented with c43891d and will be part of Release v1.3.0

-Markus