ner: docker-compose build / up fails

```
Collecting psycopg2==2.9.5
Downloading psycopg2-2.9.5.tar.gz (384 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 384.3/384.3 kB 13.3 MB/s eta 0:00:00
Preparing metadata (setup.py): started
Preparing metadata (setup.py): finished with status 'error'
error: subprocess-exited-with-error

× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [23 lines of output]
running egg_info
creating /tmp/pip-pip-egg-info-ggtkyjjc/psycopg2.egg-info
writing /tmp/pip-pip-egg-info-ggtkyjjc/psycopg2.egg-info/PKG-INFO
writing dependency_links to /tmp/pip-pip-egg-info-ggtkyjjc/psycopg2.egg-info/dependency_links.txt
writing top-level names to /tmp/pip-pip-egg-info-ggtkyjjc/psycopg2.egg-info/top_level.txt
writing manifest file '/tmp/pip-pip-egg-info-ggtkyjjc/psycopg2.egg-info/SOURCES.txt'

Error: pg_config executable not found.

pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:

python setup.py build_ext --pg-config /path/to/pg_config build ...

or with the pg_config option in 'setup.cfg'.

If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.

For further information please check the 'doc/src/install.rst' file (also at
).

[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

[notice] A new release of pip is available: 23.0.1 -> 23.2.1
[notice] To update, run: pip install --upgrade pip

```

Fixed with `RUN apt update && apt-get install -y libpq-dev `