Add: Missing EXPOSE to Oracle and RHEL Dockerfiles (#59)

Author: n-thumann

operating_systems/oraclelinux/Dockerfile

@@ -11,4 +11,6 @@ RUN if [ "$UPDATED" = true ]; then yum upgrade -y && yum clean all; fi \
     && (ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N "" || true) \
     && (ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N "" || true)
 
-CMD [ "/usr/sbin/sshd", "-D" ]
+CMD [ "/usr/sbin/sshd", "-D" ]
+
+EXPOSE 22

operating_systems/rhel/Dockerfile

@@ -20,3 +20,5 @@ RUN if [ "$UPDATED" = true ]; then \
     && ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ""
 
 CMD [ "/usr/sbin/sshd", "-D" ]
+
+EXPOSE 22