Add Gitea container workflow and modernize build process with uv

Co-authored-by: Junie <junie@jetbrains.com>

Dockerfile

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+# Use a Python image with uv pre-installed
+FROM ghcr.io/astral-sh/uv:python3.12-alpine AS builder
+
+# Set the working directory
+WORKDIR /app
+
+# Enable bytecode compilation
+ENV UV_COMPILE_BYTECODE=1
+# Copy from the cache instead of linking
+ENV UV_LINK_MODE=copy
+
+# Install dependencies
+RUN --mount=type=cache,target=/root/.cache/uv \
+    --mount=type=bind,source=uv.lock,target=uv.lock \
+    --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
+    uv sync --frozen --no-install-project --no-dev
+
+# Final image
+FROM python:3.12-alpine
+
+# Create a non-privileged user
+RUN adduser --disabled-password --gecos "" appuser
+
+WORKDIR /app
+
+# Copy the virtualenv from the builder
+COPY --from=builder --chown=appuser:appuser /app/.venv /app/.venv
+
+# Set environment variables
+ENV PATH="/app/.venv/bin:$PATH"
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV DJANGO_ALLOWED_HOSTS=*
+
+# Copy the application code
+COPY --chown=appuser:appuser . .
+
+# Switch to the non-privileged user
+USER appuser
+
+# Run the Django app
+# The Django project root is at /app/isotables/
+WORKDIR /app/isotables
+EXPOSE 8000
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]