fixup: missing echo in bashrc source

Author: gknapp1

docker/ubuntu

@@ -95,7 +95,7 @@ RUN { \
     } > /.bashrc \
 &&  { \
       echo '#!/bin/sh' \
-      && . /.bashrc \
+      && echo '.' /.bashrc \
       && echo 'exec "$@"'; \
     } > /entrypoint.sh \
 && chmod a+x /entrypoint.sh \