Add revoke.sh

Dockerfile

@@ -2,6 +2,7 @@ FROM centos:7
 ENTRYPOINT ["/tmp/docker-entrypoint.sh"]
 COPY docker-entrypoint.sh \
      keygen.sh \
+     revoke.sh \
      /tmp/
 COPY openvpn/ /etc/openvpn/
 COPY stonevpn.conf /etc/stonevpn.conf