Add docker file varnish

varnish/start.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -e
+
+for name in BACKEND_PORT BACKEND_HOST VARNISH_SERVER
+do
+    eval value=\$$name
+    sed -i "s|\${${name}}|${value}|g" /etc/varnish/default.vcl
+done
+
+exec bash -c \
+    "exec varnishd \
+    -a :$VARNISH_PORT \
+    -T localhost:6082 \
+    -F -u varnish \
+    -f $VARNISH_CONFIG \
+    -s malloc,$CACHE_SIZE \
+    $VARNISHD_PARAMS"