Added Docker stuff.

Dockerfile

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+FROM python:3.9
+
+COPY app.py /usr/src/portal-webapp/
+COPY templates /usr/src/portal-webapp/templates
+WORKDIR /usr/src/portal-webapp
+
+RUN pip install --no-cache-dir flask flask-dropzone gunicorn
+
+CMD ["gunicorn", "--bind", "0.0.0.0:80", "-w", "1", "--access-logfile", "-", "app:app"]

docker-compose.yml

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+version: "3"
+services:
+  webapp:
+    build: .
+    restart: always
+    ports:
+      - 127.0.0.1:5000:80
+    volumes:
+      - /tmp/uploads/:/usr/src/portal-webapp/uploads