make sure the ssh config is set to ignore known hosts

Change-Id: I2e1125148b7535663a05eba2d5bdb8a5f006a1db
(cherry picked from commit ff5632dfffa4bb1b28dce2076846afeb291a8ff4)
diff --git a/automation/Dockerfile b/automation/Dockerfile
index 0d90247..f32ccf9 100644
--- a/automation/Dockerfile
+++ b/automation/Dockerfile
@@ -26,4 +26,7 @@
 WORKDIR /go
 RUN go install gerrit.opencord.org/maas/cord-maas-automation
 
+RUN mkdir -p /root/.ssh
+COPY ssh-config /root/.ssh/config
+
 ENTRYPOINT ["/go/bin/cord-maas-automation"]