docker: add dist-worker dockerfile with sshd

docker/Dockerfile.dist-worker

+FROM simbricks/simbricks:latest
+RUN apt-get update \
+ && apt-get install -y \
+	openssh-server \
+ && rm -rf /var/lib/apt/lists/* \
+ && mkdir -p /run/sshd \
+ && ssh-keygen -N '' -f ~/.ssh/id_rsa \
+ && cat ~/.ssh/id_rsa.pub >~/.ssh/authorized_keys
+CMD ["/usr/sbin/sshd","-D", "-p", "2222"]

docker/rules.mk

@@ -31,5 +31,7 @@ docker-images:
 		-f docker/Dockerfile.runenv docker
 	docker build -t simbricks/simbricks-min:latest \
 		-f docker/Dockerfile.min docker
+	docker build -t simbricks/simbricks-dist-worker:latest \
+		-f docker/Dockerfile.dist-worker docker
 
 include mk/subdir_post.mk