Dockerize the app

Dockerfile

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+FROM python:3-slim-buster
+
+WORKDIR /app
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+ENV DATABASE_URL sqlite:////data/app.db
+COPY ./requirements.txt /app/requirements.txt
+RUN apt-get update && \
+    apt-get install -y gosu && \
+    rm -rf /var/lib/apt/lists/* && \
+    pip install -r requirements.txt && pip install gunicorn
+COPY . /app/
+ENTRYPOINT ["/app/entrypoint.sh"]
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "app:create_app()"]

app/__init__.py

@@ -1,11 +1,14 @@
+import os
 from flask import Flask
 
 
 def create_app():
     app = Flask(__name__)
-    app.config['SECRET_KEY'] = "raleicuu0Engohh3iageephoh3looge0okupha2omeiph7Nooyeey1tiewooxu7phaeshi0ohlaaThai2eth1oapong5iroo4fieleekaidohmoh1eYahjei9Yi6aema"
-    app.config['SQLALCHEMY_ECHO'] = True
-    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///app.db'
+    app.config['SECRET_KEY'] = os.getenv(
+        "FLASK_SECRET_KEY", "raleicuu0Engohh3iageephoh3looge0okupha2omeiph7Nooyeey1tiewooxu7phaeshi0ohlaaThai2eth1oapong5iroo4fieleekaidohmoh1eYahjei9Yi6aema")
+    app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv(
+        "DATABASE_URL", "sqlite:///app.db")
+    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
     from . import db
     db.init_app(app)

docker-compose-example.yaml

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+version: '3'
+volumes:
+    data:
+
+services:
+    app:
+        build: .
+        volumes:
+            - data:/data
+        ports:
+            - 3103:5000
+        environment:
+            - FLASK_SECRET_KEY="changeme"
+

entrypoint.sh

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+#!/bin/bash
+chown -R www-data:www-data /data
+flask db upgrade && gosu www-data "$@"
+

requirements.txt

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+alembic==1.4.2
+autopep8==1.5.4
+bcrypt==3.2.0
+cffi==1.14.2
+click==7.1.2
+Flask==1.1.2
+Flask-Bcrypt==0.7.1
+Flask-Login==0.5.0
+Flask-Migrate==2.5.3
+Flask-SQLAlchemy==2.4.4
+Flask-WTF==0.14.3
+itsdangerous==1.1.0
+Jinja2==2.11.2
+Mako==1.1.3
+MarkupSafe==1.1.1
+pycodestyle==2.6.0
+pycparser==2.20
+python-dateutil==2.8.1
+python-editor==1.0.4
+six==1.15.0
+SQLAlchemy==1.3.19
+toml==0.10.1
+Werkzeug==1.0.1
+WTForms==2.3.3