Fix the problem that some extensions need to be installed from src
Now, because the step of installing extensions is moved forward in
`entrypoint.sh` instead of `startup.sh`, we cannot install some required
packages before executing `install.py`
When installing the extension `sd-webui-roop`, it relies on
`insightface==0.7.3`, and when installing this pypi package, it is found
that when building the wheel package, an error will be reported because
`gcc` cannot be found
ddc02ee1a9/requirements.txt (L1)
Therefore, considering that not all pypi packages are distributed in
wheel, those pypi packages distributed in src need `build-essential` to
build
37a82af4b7