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Hi is there a way to build a flow in a docker container without registering it? I can't seem to find it in the documentation but I'm trying to do something like this in my deploy script.
```prefect build -p my_flow.py```
which throws this usage error
```Usage: prefect [OPTIONS] COMMAND [ARGS]...
Try 'prefect -h' for help.

Error: No such command 'build'.

Exited with code exit status 2```

Hi <@U01H2DCUAGN>. What prefect version are you on?