Fix regression in container that broke tiled serve directory ... and tiled register ...

[danielballan]

Checklist

• Add a Changelog entry
• Add the ticket number which this PR closes to the comment section

[danielballan]

Reproducing the issue reported by @burkeds in Mattermost:

$ podman run ghcr.io/bluesky/tiled:v0.1.0b10 tiled serve directory /storage
...
ModuleNotFoundError: No module named 'entrypoints'

Using a container built from this PR branch:

$ podman run localhost/test-fix:latest tiled serve directory /storage
Creating catalog database at /tmp/tmpxb8cw_9k/catalog.db

    Navigate a web browser or connect a Tiled client to:

    http://127.0.0.1:8000?api_key=c27a4a172ee5d29ce2983becdf6dfd4f6819ff0115ea4d65204583e7973b23e5


[-] INFO:     Started server process [1]
[-] INFO:     Waiting for application startup.
Tiled version 0.1.0b11.dev25+ge5511f8b
[-] INFO:     Application startup complete.
[-] INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
[64e9e349bdba96c4] 127.0.0.1:55610 (public) - "GET /api/v1/ HTTP/1.1" 200 OK
[44a98a02d5ae53de] 127.0.0.1:55610 (admin) - "GET /api/v1/metadata/?include_data_sources=false HTTP/1.1" 200 OK
Server is up. Indexing files in /storage...
[34f44b7e2e408b85] 127.0.0.1:55610 (admin) - "DELETE /api/v1/nodes/ HTTP/1.1" 200 OK
Indexing complete.