ensure file permissions on certificate key is secure (#15)

Author: albertrdixon

scripts/docker-entrypoint.sh

@@ -6,6 +6,7 @@ fi
 
 if test -n "$DATABASE_CLIENT_KEY_B64"; then
   echo "$DATABASE_CLIENT_KEY_B64" | base64 -d >/tmp/client-key.pem
+  chmod 0600 /tmp/client-key.pem
 fi
 
 if test -n "$DATABASE_SERVER_CA_B64"; then