Initial Flask hello world app

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+ENV FLASK_APP=app.py
+ENV FLASK_DEBUG=1
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+EXPOSE 5000
+
+CMD ["flask", "run", "--host=0.0.0.0", "--port=5000", "--debug"]

app.py

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+from flask import Flask
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello():
+    return "<h1>Hello, World!</h1>"
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000, debug=True)

requirements.txt

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+flask==3.1.0