Fix mounts to work with enforcing SELinux

Also works with disabled SELinux.

Resolves #1

Change-Id: I8726640c93fe205754eca14b7752071274bb342e
diff --git a/docker-compose.yml b/docker-compose.yml
index 29d8a48..fe91227 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -11,4 +11,4 @@
     expose:
       - "8089"
     volumes:
-      - "${INDEX}:/kustvakt/index"
+      - "${INDEX}:/kustvakt/index:z"