docker: add ssh config to dist image

increases connection limits, disables host fingerprint checking, enables persistent connections

docker/Dockerfile.dist-worker

@@ -5,5 +5,8 @@ RUN apt-get update \
  && 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
+ && cat ~/.ssh/id_rsa.pub >~/.ssh/authorized_keys \
+ && mkdir ~/.ssh/controls
+COPY dist/ssh_config /etc/ssh/ssh_config.d/simbricks.conf
+COPY dist/sshd_config /etc/ssh/sshd_config.d/simbricks.conf
 CMD ["/usr/sbin/sshd","-D", "-p", "2222"]

docker/dist/ssh_config

+
+Host *
+    StrictHostKeyChecking no
+    UserKnownHostsFile /dev/null
+    ControlPath ~/.ssh/controls/%r@%h:%p
+    ControlPersist 1h
+    ControlMaster auto

docker/dist/sshd_config

+
+MaxSessions 2048
+MaxStartups 2048