add purge varnish hook (initial)

contrib/tools/hooks/purge-varnish.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+#
+# this script can be called via hooks for each post to purge varnish cache on new post
+#
+
+if [ "$3" == "" ] ; then
+		op="$2"
+else
+		op="$3"
+fi
+
+# ip to bind to when doing http request
+ip="127.0.1.1"
+
+# purge thread page
+curl --interface "$ip" -v -X PURGE http://$varnish/thread-$(sha1sum <<< "$op" | cut -d' ' -f1).html
+# purge board page
+curl --interface "$ip" -v -X PURGE http://$varnish/$1-0.html