Statement loader web app with Docker image and Gitea Actions build

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Dockerfile

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+FROM python:3.12-slim
+
+ENV PYTHONUNBUFFERED=1 DATA_DIR=/data BIND=0.0.0.0 PORT=8765
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY statement_loader.py app.py app_page.html app_dashboard.html ./
+
+# statements, Bills_Tracker.xlsx and backups live in this volume, never in the image
+RUN useradd -m -u 1000 app && mkdir /data && chown app /data
+USER app
+VOLUME /data
+EXPOSE 8765
+
+HEALTHCHECK --interval=30s --timeout=5s CMD python -c "import urllib.request;urllib.request.urlopen('http://127.0.0.1:8765/dashboard')" || exit 1
+CMD ["python", "app.py"]