Add environment variables to docker config so we can have a dev server

host/next/docker/env.example

@@ -0,0 +1,8 @@
+NETWORK=nginx-bridge
+CONTAINER_NAME=techtracker-next
+DOMAIN_NAME=techtracker.gbrown.org
+# Port is disabled by default as suggested
+# config is to have reverse proxy on the same
+# network so you can just forward to the
+# port on the internal network.
+PORT=3000