docs: readme

Author: neurosnap

.gitignore

@@ -6,3 +6,4 @@ build/*
 ssh_data
 __debug_bin
 .bin
+.env

README.md

@@ -21,6 +21,8 @@ access.
 For example, have you ever wished you could use `docker push` and `docker pull`
 using just an SSH keypair? Well now it's possible.
 
+Run our [cmd/docker](./cmd/docker/) example to see it in action!
+
 We built this library to support [imgs.sh](https://pico.sh/imgs): a private
 docker registry leveraging SSH tunnels.
 

cmd/docker/main.go

@@ -36,9 +36,14 @@ func serveMux(ctx ssh.Context) http.Handler {
 	router := http.NewServeMux()
 	slug := ctx.User()
 
+	registryUrl := os.Getenv("REGISTRY_URL")
+	if registryUrl == "" {
+		registryUrl = "registry:5000"
+	}
+
 	proxy := httputil.NewSingleHostReverseProxy(&url.URL{
 		Scheme: "http",
-		Host:   "registry:5000",
+		Host:   registryUrl,
 	})
 
 	oldDirector := proxy.Director