docker: Add PIVX, Dash and Firo to isolated config

Changed pivx-params location to PIVX datadir.

Still need a way to set the Firo wallet seed.

docker/production/dash/entrypoint.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+
+if [[ "$1" == "dash-cli" || "$1" == "dash-tx" || "$1" == "dashd" || "$1" == "test_dash" ]]; then
+	mkdir -p "$DASH_DATA"
+
+	chown -h dash:dash /home/dash/.dash
+	exec gosu dash "$@"
+else
+	exec "$@"
+fi