test: add apache, caddy, and nginx smoke test environments

Signed-off-by: Xe Iaso <me@xeiaso.net>

test/nginx/conf.d/http.conf

@@ -0,0 +1,10 @@
+server {
+       listen 80;
+       listen [::]:80;
+       server_name nginx.local.cetacean.club;
+
+       location / {
+              proxy_pass http://anubis:3000;
+              include snippets/proxy_params;
+       }
+}