Docker package problem

[tf13]

Hi. I'm trying to follow the instructions in the documentation for running Datasette in Docker.

When I use datasette package subdirectory/database.sqlite, everything appears to work, but the Docker commands end after step 5:

 => CACHED [1/5] FROM docker.io/library/python:3.8@sha256:caa7d8d6bfaa181  0.0s
 => [2/5] COPY . /app                                                      0.0s
 => [3/5] WORKDIR /app                                                     0.0s
 => [4/5] RUN pip install -U datasette                                    15.2s
 => [5/5] RUN datasette inspect excerpts.sqlite --inspect-file inspect-da  1.1s
 => exporting to image                                                     0.3s 
 => => exporting layers                                                    0.3s 
 => => writing image sha256:bfbd59c3fc4dd4a2948df769e386d8e18e61e3d9865dd  0.0s 

And that's it. docker run doesn't work of course. Missing are the following steps shown in the example output in the docs (which obviously has a different db name):

Step 6/7 : EXPOSE 8001
 ---> Using cache
 ---> 8e83844b0fed
Step 7/7 : CMD datasette serve parlgov.db --port 8001 --inspect-file inspect-data.json --setting sql_time_limit_ms 2500
 ---> Using cache
 ---> 1bd380ea8af3
Successfully built 1bd380ea8af3

Any idea what I'm doing wrong? Thanks!