move static host to its own app, ko to its own subdomain

cmd/app/kodata/index.html

@@ -20,15 +20,15 @@ bytes.  You can request a specific size and shape of random image. For example,
 <code>kontain.me/random:4x100</code> generates a random image of 4 layers of
 100 random bytes each.
 
-<h1><code>kontain.me</code></h1>
+<h1><code>ko.kontain.me</code></h1>
 
-<p><code>docker pull kontain.me/ko/[import path]</code> serves an image
+<p><code>docker pull ko.kontain.me/ko/[import path]</code> serves an image
 containing a Go binary fetched using <code>go get</code> and built into a
 container image using <a
 	href="https://github.com/google/ko"><code>ko</code></a>.</p>
 
 <p>For example,
-<code>docker pull kontain.me/ko/github.com/google/ko/cmd/ko</code> will fetch,
+<code>docker pull ko.kontain.me/ko/github.com/google/ko/cmd/ko</code> will fetch,
 build and (eventually) serve a Docker image containing <code>ko</code> itself.
 <i>Koception!</i></p>
 

cmd/app/main.go

@@ -0,0 +1,34 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	http.Handle("/", http.FileServer(http.Dir("/var/run/ko")))
+	log.Println("Starting...")
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+		log.Printf("Defaulting to port %s", port)
+	}
+	log.Printf("Listening on port %s", port)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), nil))
+}

cmd/ko/main.go

@@ -49,7 +49,6 @@ func main() {
 		info:  lg.StandardLogger(logging.Info),
 		error: lg.StandardLogger(logging.Error),
 	})
-	http.Handle("/", http.FileServer(http.Dir("/var/run/ko")))
 
 	log.Println("Starting...")
 	port := os.Getenv("PORT")