util/docker: Add docker files for coreboot-sdk & jenkins builders

Add the coreboot specific docker configuration files to the coreboot
repo.  These have been copied directly from Patrick's repo where they
had been being stored.

- coreboot-sdk: debian sid with the coreboot toolchain
- coreboot-jenkins-node: built on top of the coreboot-sdk, adds the
pieces required for building everything with the coreboot jenkins
builders.

Change-Id: I8628d4edb298264e814e02e124a8bfb4bc04e0c7
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14830
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/docker/coreboot-jenkins-node/README.md

@@ -0,0 +1,3 @@
+run with
+
+    docker run --privileged --restart=always -d -p 49151:49151 -v $host/path/to/ccache:/home/coreboot/.ccache -v $host/path/to/data/cache:/data/cache coreboot/coreboot-jenkins-node