Added a script to generate the certificates

.dockerignore

@@ -9,3 +9,4 @@ TODO.md
 includes/postgresql-9.3-tsearch-extras
 includes/zulip-puppet-config
 docker-compose.yml
+scripts/

scripts/generate_certs.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+command -v openssl >/dev/null 2>&1 || { echo >&2 "openssl package not installed.  Aborting."; exit 1; }
+
+openssl genrsa -des3 -passout pass:x -out server.pass.key 4096
+openssl rsa -passin pass:x -in server.pass.key -out zulip.key
+rm -f server.pass.key
+openssl req -new -key zulip.key -out server.csr
+openssl x509 -req -days 365 -in server.csr -signkey zulip.key -out zulip.combined-chain.crt
+rm -f server.csr
+echo "Copy the following files to the docker-zulip data folder:"
+echo "* zulip.key"
+echo "* zulip.combined-chain.crt"