refactor: rename driver to image, first pass

mcontainer/images/goose/entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Entrypoint script for Goose image
+# Executes the standard initialization script, which handles user setup,
+# service startup (like sshd), and switching to the non-root user
+# before running the container's command (CMD).
+
+exec /mc-init.sh "$@"