update repository references and improve script handling

proxy/rootfs/etc/services.d/nginx/finish

@@ -0,0 +1,8 @@
+#!/usr/bin/execlineb -S0
+# ==============================================================================
+# Take down the S6 supervision tree when NGINX fails
+# ==============================================================================
+if -n { s6-test $# -ne 0 }
+if -n { s6-test ${1} -eq 256 }
+
+s6-svscanctl -t /var/run/s6/services