docker/coreboot-jenkins-node: Add zephyr-sdk toolchain

There are efforts to replace Chrome EC with Zephyr. To ensure
Chromebook specific Zephyr developments (that can eventually be
built as part of a coreboot build just like Chrome EC now, and are
built with coreboot-sdk) don't break with Zephyr's toolchain, add
the toolchain to our builders so we can do some sanity checking.

Change-Id: I645a298bc350ebe7651c08aea630bdc6b93856aa
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49986
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

util/docker/coreboot-jenkins-node/Dockerfile

@@ -13,6 +13,12 @@
 #          Because we're piping the contents of the dockerfile into the
 #          docker build command, the 'COPY' keyword isn't valid.
 
+FROM coreboot/coreboot-sdk:{{SDK_VERSION}} AS zephyr-sdk
+USER root
+RUN wget -O zephyr.run https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.11.3/zephyr-sdk-0.11.3-setup.run
+RUN chmod +x ./zephyr.run
+RUN ./zephyr.run -- -d /opt/zephyr-sdk
+
 FROM coreboot/coreboot-sdk:{{SDK_VERSION}}
 MAINTAINER Martin Roth <martin@coreboot.org>
 USER root
@@ -52,6 +58,8 @@ RUN gcc -o /usr/sbin/encapsulate /tmp/encapsulate.c && \
 	chown root /usr/sbin/encapsulate && \
 	chmod +s /usr/sbin/encapsulate
 
+COPY --from=zephyr-sdk /opt/zephyr-sdk /opt/zephyr-sdk
+
 VOLUME /data/cache
 ENTRYPOINT mount /cb-build && \
 	mount /home/coreboot/node-root/workspace && \