feat: implement SPA loading bar, harden status page logic, and optimize Dockerfile

Dockerfile

@@ -1,10 +1,34 @@
-FROM python:3.10-bullseye
+# Use a slimmer base image to reduce image size and pull times
+FROM python:3.10-slim-bullseye
 LABEL maintainer="Andrew Simonson <asimonson1125@gmail.com>"
 
+# Set environment variables for better Python performance in Docker
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
 WORKDIR /app
 
+# Create a non-root user for security
+RUN groupadd -r appuser && useradd -r -g appuser appuser
+
+# Copy only the requirements file first to leverage Docker layer caching
+COPY src/requirements.txt .
+
+# Install dependencies as root, but then switch to the non-root user
+RUN pip install -r requirements.txt
+
+# Copy the rest of the source code
 COPY src/ .
 
-RUN pip install --no-cache-dir -r requirements.txt
+# Ensure the appuser owns the app directory
+RUN chown -R appuser:appuser /app
 
-CMD [ "gunicorn", "--bind", "0.0.0.0:8080", "app:app"]
+# Switch to the non-root user for better security
+USER appuser
+
+# Expose the port (Gunicorn's default or specified in CMD)
+EXPOSE 8080
+
+# Start Gunicorn
+CMD ["gunicorn", "--bind", "0.0.0.0:8080", "app:app"]