Docker mix and match setup

Rewrite of the docker setup. Now uses fig to manage containers and container
linkage. The base is a block based mix and match, which will give you the
possibility to easily test all configurations.

docker/templates/init_gogs.sh.tpl

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ ! -d "$DIRECTORY" ]; then
+    mkdir -p $GOGS_CUSTOM_CONF_PATH
+
+echo "
+{{ CONFIG }}
+" >> $GOGS_CUSTOM_CONF
+    
+fi
+
+exec "$@"