Created Dockerfile

.python-version

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+3.10.13

Dockerfile

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+FROM ubuntu:22.04
+RUN apt-get update \
+	&& apt-get install python3 python3-pip -y \
+	 && mkdir /app/ \
+	 && mkdir /req/
+ADD requirements.txt /req/
+
+WORKDIR /
+ADD app /app
+RUN pip install -r /req/requirements.txt
+ENV FLASK_ENV=DEVELOPMENT
+ENV FLASK_RUN_HOST=0.0.0.0
+EXPOSE 5000
+CMD ["python3","/app/app.py"]

Dockerfile_Lector_Solution

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+FROM ubuntu:22.04
+
+RUN apt-get update \
+      && apt-get install -y --no-install-recommends \
+       python3 \
+       python3-pip \
+      && mkdir -p /app \
+      && useradd -d /app -s /bin/bash app \
+      && chown -R app:app /app
+
+COPY requirements.txt /app/requirements.txt
+RUN pip3 install -r /app/requirements.txt
+
+COPY app/app.py /app
+WORKDIR /app
+
+USER app
+
+CMD ["python3", "app.py"]

app/app.py

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+import os
+
+from flask import Flask
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello_world():
+    return "Hello, World!"
+
+
+if __name__ == "__main__":
+    app.run(debug=True,host="0.0.0.0",port=os.environ.get("PORT", 5000))

app/app_test.py

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+import unittest
+
+from app import app
+
+
+class TestApp(unittest.TestCase):
+    def setUp(self):
+        self.client = app.test_client()
+
+    def test_hello_world(self):
+        response = self.client.get("/")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data, b"Hello, World!")
+
+
+if __name__ == "__main__":
+    unittest.main()

requirements.txt

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+blinker==1.6.3 ; python_version >= "3.10" and python_version < "4.0"
+click==8.1.7 ; python_version >= "3.10" and python_version < "4.0"
+colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"
+flask==3.0.0 ; python_version >= "3.10" and python_version < "4.0"
+itsdangerous==2.1.2 ; python_version >= "3.10" and python_version < "4.0"
+jinja2==3.1.2 ; python_version >= "3.10" and python_version < "4.0"
+markupsafe==2.1.3 ; python_version >= "3.10" and python_version < "4.0"
+werkzeug==3.0.0 ; python_version >= "3.10" and python_version < "4.0"