feat: add support for Go, Ruby, and NuGet modules with integration testing configurations

Signed-off-by: d9pouces <github@19pouces.net>

tests/dockerfiles/repos/nuget-repo.nginx.conf

@@ -0,0 +1,22 @@
+server {
+    listen 8443 ssl default_server;
+    server_name _;
+
+    ssl_certificate     /etc/nginx/certs/repo-server.crt.pem;
+    ssl_certificate_key /etc/nginx/certs/repo-server.key.pem;
+
+    root /srv;
+    autoindex off;
+
+    # The service index bakes in a __BASE_URL__ placeholder for its "@id"
+    # fields, since the host:port this fixture is actually reached on is
+    # only known once tox-docker starts the container, not at image-build
+    # time. $http_host reflects exactly what the client (nuget) used to
+    # connect, e.g. host.docker.internal:55123.
+    location = /index.json {
+        default_type application/json;
+        sub_filter '__BASE_URL__' 'https://$http_host';
+        sub_filter_once off;
+        sub_filter_types application/json;
+    }
+}