Committing first Dockerfile and requirements.txt for a Python App.

.python-version

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+3.11.8

Dockerfile

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+#Ubuntu 22.04 base image
+FROM ubuntu:22.04
+
+#Copy the requirements file
+COPY requirements.txt .
+
+#Install python3
+RUN apt-get update && apt-get install -y python3 python3-pip \
+    && useradd -m -s /bin/bash nruser \
+    && pip install -r requirements.txt \
+    && mkdir /app
+
+#Copy app
+COPY --chown=nruser app /app
+
+#Switch to the non-root user
+USER nruser
+
+#Add work dir
+WORKDIR /app
+
+#Expose the port
+EXPOSE 5000
+
+#Add entrypoint
+ENTRYPOINT [ "python3"]
+
+#Run the app
+CMD ["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(port=os.environ.get("PORT", 3000), host="0.0.0.0")

requirements.txt

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+flask==3.0.0