Add production Docker stack with nginx and Tor.

Mirror NullCart's clearnet HTTPS and onion hidden-service pattern for serving the static promo site on a VPS.

nginx/docker-entrypoint.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -eu
+
+export CLEARNET_DOMAIN
+envsubst '${CLEARNET_DOMAIN}' \
+    < /etc/nginx/templates/conf.d/clearnet.conf.template \
+    > /etc/nginx/conf.d/clearnet.conf
+
+cp /etc/nginx/templates/conf.d/onion.conf /etc/nginx/conf.d/onion.conf
+
+exec nginx -g 'daemon off;'