progressively working deploy scenario

docker-entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+# Render the nginx config template with environment variables, then start nginx.
+set -e
+
+envsubst '${API_UPSTREAM}' < /etc/nginx/conf.d/nginx.conf.template > /etc/nginx/conf.d/default.conf
+
+exec nginx -g 'daemon off;'