Docker image 1.13 does not support --loom

[nodreb-borrus]

Describe the bug
The latest docker image for the 1.13 release can not make use of the --loom option via the start-urbit script included in the image. It appears that script does not pass through additional options.

To Reproduce
Steps to reproduce the behaviour:

1. Start an urbit container with a command like: /bin/start-urbit -t --port=42424 --loom 32
2. Use ps to view processes on the host system.
3. Find the process from the container and note it is missing the loom option: urbit -t -p 42424 ship-name

System (please supply the following information, if relevant):

• OS: Debian Linux 11 running Docker
• Urbit 1.13

[nodreb-borrus]

#6110

[zalberico]

@joemfb I saw your comments in the linked PR #6110 (thanks), assigning this to you so it doesn't get dropped.

[zalberico]

Closing this since we now manage these in https://github.com/urbit/vere