feat: add heroku with caddy

Author: wurstbrot

Caddyfile

@@ -1,9 +1,19 @@
 {
-    http_port {$PORT}
+	http_port {$PORT}
 }
 
-localhost:{$PORT} {
-    encode gzip
-    log stdout
-    file_server
-}
+:{$PORT}, localhost:{$PORT} {
+	log stdout
+	file_server {
+		root /srv
+	}
+
+	header / {
+		X-Content-Type-Options "nosniff"
+		X-XSS-Protection "1; mode=block"
+		X-Robots-Tag "none"
+		X-Download-Options "noopen"
+		X-Permitted-Cross-Domain-Policies "none"
+		Referrer-Policy "no-referrer"
+	}
+}