Fix psychopg2-binary missing package error in GitHub Actions

Author: geekygirlsarah

Dockerfile

@@ -1,6 +1,10 @@
-FROM python:3-slim
+FROM python:3.12-slim
 ENV PYTHONBUFFERED=1
 WORKDIR /code
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libpq-dev \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
 COPY requirements.txt /code/
 RUN pip install --no-cache-dir -r requirements.txt
 COPY . .