Add self-hosted combined timesheet server

Dockerfile

@@ -0,0 +1,13 @@
+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PYTHONPATH=/srv
+WORKDIR /srv
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY app ./app
+RUN useradd --system --create-home appuser && mkdir -p /data/call-imports && chown -R appuser:appuser /srv /data
+USER appuser
+EXPOSE 3000
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "3000"]