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/pivx/entrypoint.sh

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