update entrypoint.sh to use uv for EXTRA_PIP_PACKAGES

[zzstoatzz]

I am thinking that this might require an integration test to make sure it plays nicely python paths during standard usage

» docker run -p 4200:4200 -e EXTRA_PIP_PACKAGES=pandas --rm uv-test -- prefect server start --host 0.0.0.0
+uv pip install pandas
Using Python 3.9.21 environment at: /usr/local
Resolved 6 packages in 229ms
Prepared 2 packages in 1.48s
Installed 2 packages in 22ms
 + numpy==2.0.2
 + pandas==2.2.3

 ___ ___ ___ ___ ___ ___ _____
| _ \ _ \ __| __| __/ __|_   _|
|  _/   / _|| _|| _| (__  | |
|_| |_|_\___|_| |___\___| |_|

Configure Prefect to communicate with the server with:

    prefect config set PREFECT_API_URL=http://0.0.0.0:4200/api

View the API reference documentation at http://0.0.0.0:4200/docs

Check out the dashboard at http://0.0.0.0:4200

[codspeed-hq]

CodSpeed Performance Report

Merging #16291 will not alter performance

_{Comparing uv-extra-pip-packages (13d2f89) with main (404090b)}

Summary

✅ 3 untouched benchmarks