Completed solution on Dockerfile and instructions

Dockerfile

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+ARG PYTHON_VERSION=3.9-slim
+FROM python:${PYTHON_VERSION} AS builder
+
+WORKDIR /app
+
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+
+COPY . .
+RUN python manage.py migrate
+
+FROM python:${PYTHON_VERSION}
+
+ENV PYTHONUNBUFFERED=1
+ENV PATH="/opt/venv/bin:$PATH"
+
+WORKDIR /app
+
+COPY --from=builder /opt/venv /opt/venv
+COPY --from=builder /app .
+
+EXPOSE 8080
+
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8080"]

INSTRUCTION.md

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+[Docker Image](https://hub.docker.com/r/somewellich/todoapp)
+
+## Instructions for building and running the container
+
+1. First, build the local image named exactly `todoapp`:
+``` bash
+docker build -t todoapp .
+```
+Next, we need to add a tag with the personal Docker Hub namespace.
+Explanation: `todoapp` is the local image name. `somewellich/todoapp:1.0.0` is the namespaced repository tag required by Docker Hub to know where to upload the image and what version it is.
+
+```bash
+docker tag todoapp somewellich/todoapp:1.0.0
+```
+Run the container:
+
+```bash
+docker run -d -p 8080:8080 somewellich/todoapp:1.0.0
+```
+## Instructions on accessing the application via a browser
+
+http://localhost:8080/
+
+OR
+
+[http://127.0.0.1:8080/](http://127.0.0.1:8080/)