Debian sid is too unstable at this point, and frequently ends up having issues that cause the coreboot-sdk docker image to fail to build. Using stable also better reflects what users will typically be running. Also remove the parameters to quiet the apt-get install command so that if something does break, we can see what happened more easily. Fixes bug 536 Signed-off-by: Martin Roth <gaumless@gmail.com> Change-Id: I41b6464b024df89c114db2cdb9367c0526eb0297 Reviewed-on: https://review.coreboot.org/c/coreboot/+/82411 Reviewed-by: Matt DeVillier <matt.devillier@gmail.com> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>