Merge pull request #3108 from cwesMills/s390xubuntu

Updated Dockerfile to copy known_hosts file s390x ubuntu16

buildenv/jenkins/docker-slaves/s390x/ubuntu16/Dockerfile

@@ -20,7 +20,9 @@
 
 # To use this docker file:
 # First copy your public ssh key into a file named authorized_keys next to the Dockerfile
-# Make sure you are in the directory contianing the Dockerfile and authorized_keys file
+# Then include a known_hosts file next to the Dockerfile, with github as a saved host
+# This can be done with "ssh-keyscan github.com >> path_to_dockerfile/known_hosts"
+# Make sure you are in the directory contianing the Dockerfile, authorized_keys file, and known_hosts file
 # Then run:
 #   docker build -t openj9 -f Dockerfile .
 #   docker run -it openj9
@@ -89,10 +91,11 @@ RUN rm /usr/bin/c++ /usr/bin/g++ /usr/bin/cc /usr/bin/gcc \
   && ln -s gcc /usr/bin/cc \
   && ln -s gcc-4.8 /usr/bin/gcc
 
-# Add user home/USER
+# Add user home/USER and copy authorized_keys and known_hosts
 RUN useradd -ms /bin/bash ${USER} \
   && mkdir /home/${USER}/.ssh/
 COPY authorized_keys /home/${USER}/.ssh/authorized_keys
+COPY known_hosts /home/${USER}/.ssh/known_hosts
 RUN chown -R ${USER}:${USER} /home/${USER} \
   && chmod 644 /home/${USER}/.ssh/authorized_keys
 

buildenv/jenkins/known_hosts

@@ -0,0 +1 @@
+github.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==