[BUG] Missing requirements for fastapi_server_docker example

[AbdelRahmanYaghi]

Describe the bug
When running cocoindex setup main.py, it return an error stating:

Error: Failed importing file '/home/ayaghi/cocoindex/examples/fastapi_server_docker/main.py': no pq wrapper available.
Attempts made:
- couldn't import psycopg 'c' implementation: No module named 'psycopg_c'
- couldn't import psycopg 'binary' implementation: No module named 'psycopg_binary'
- couldn't import psycopg 'python' implementation: libpq library not found

To Reproduce

SETUP: Run pg17 docker on the correct port.

1. Go to the example dir: cd examples/fastapi_server_docker
2. Create a virtual env: uv venv
3. Activate the virtual env: source .venv/bin/activate
4. Install requirements: uv pip install -r requirments.txt
5. Run: cocoindex setup main.py

Expected behavior
Data getting indexed.

CocoIndex Version
Latest: 0.1.44

Additional context

• The same does not happen when running from docker. Meaning it runs successfully when running from Docker.
• Running from WSL 2 on Ubuntu

[AbdelRahmanYaghi]

After further investigation, the issue arises from the fact that when installing it locally (Not on docker), we are not installing the necessary postgress requirements. We are installing it when using docker, given by the lines:

# Install PostgreSQL client libraries
RUN apt-get update && apt-get install -y \
    libpq-dev \
    gcc \
    && rm -rf /var/lib/apt/lists/*

in the dockerfile.

One way to fix this is by replacing the pg requirement psycopg==3.2.6 with psycopg[binary]==3.2.6 which installs the binaries required by postgress. And it seems that installing the binaries both from the apt-get and from the requirements.txt works normally, so no need to fret when running the docker (since it installs it from both sources).

Please check the pull request #557