import module error when install through pip

when running
```python
python scripts/gen_ccd_cache.py -c release_data/ccd_cache/ -n 32
```
got this error :

```python
Traceback (most recent call last):
File "/teamspace/studios/this_studio/Protenix/scripts/gen_ccd_cache.py", line 24, in
import gemmi
ModuleNotFoundError: No module named 'gemmi'
```
The error happens when install through `pip install protenix`, but works fine when under docker environment

Start with scripts/gen_ccd_cache.py and reproduce the command after installing Protenix with pip. Compare the dependencies available in the pip installation with those in the Docker environment, then verify that the command can import gemmi and run successfully outside Docker.

Written by the indexing model from the issue text.