Trying to modify run.sh so it waits for the Xvfb server to start accepting connections.

package.json

@@ -9,7 +9,7 @@
   ],
   "repository": {
     "type": "git",
-    "url": "https://github.com/klokantech/tileserver-gl.git"
+    "url": "https://github.com/polar/tileserver-gl.git"
   },
   "license": "BSD-2-Clause",
   "engines": {

run.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 start-stop-daemon --start --pidfile ~/xvfb.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -screen 0 1024x768x24 -ac +extension GLX +render -noreset
-sleep 1
+
+timeout 15 bash -c 'until echo > /dev/tcp/localhost/99; do sleep 0.5; done'
 
 export DISPLAY=:99.0