Features/docker

Add Dockerfile.

Adds container support to gitlab-ci. Automate deployment of containers on develop/master branches.

docker/docker-entrypoint.sh

+#!/bin/sh
+set -e
+envsubst "$(env | sed -e 's/=.*//' -e 's/^/\$/g')" < "/etc/nginx/nginx.conf.tpl" > "/etc/nginx/nginx.conf"
+exec "$@"