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Welcome back! Now that your Flask application is running locally, it’s time to containerize it with Docker and push your code to GitHub. This guide walks you through creating a Dockerfile, staging and committing changes, working with feature branches, and opening a pull request.

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Preparing the Dockerfile

In VS Code (or your preferred editor), create a file named Dockerfile in your project root: 
FROM python:3.8-slim-buster

WORKDIR /app

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["python3", "-m", "flask", "run", "--host=0.0.0.0"]
This Dockerfile installs dependencies, copies your application code, and starts the Flask development server on all interfaces (0.0.0.0).
Use --no-cache-dir with pip to reduce image size by preventing caching of package files.

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Staging and Committing Changes

Once your Dockerfile, app.py, requirements.txt, and README.md are ready, stage all modified and new files: 
git add .
Commit with a clear, descriptive message: 
git commit -m "Add Dockerfile and initial Flask application"
Expected output: 
[main a1479f6] Add Dockerfile and initial Flask application
 4 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 Dockerfile
 create mode 100644 app.py
 create mode 100644 requirements.txt
Confirm you’re on the main branch: 
git branch
Output: 
* main
Make sure sensitive files (e.g., .env, keys) are listed in your .gitignore to avoid accidental commits.

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Branching and Pushing Feature Branch

Follow Git best practices by working in a feature branch named after your JIRA task:
  1. Create and switch to the branch: 
    git checkout -b sprint-01/jira-id-0202
  2. Push the branch to GitHub: 
    git push origin sprint-01/jira-id-0202
You should see: 
Enumerating objects: 8, done.
Counting objects: 100% (8/8), done.
Delta compression using up to 8 threads.
Compressing objects: 100% (5/5), done.
Writing objects: 100% (6/6), 730.00 KiB | 730.00 KiB/s, done.
Total 6 (delta 0), reused 0 (delta 0), pack-reused 0
remote: Create a pull request for 'sprint-01/jira-id-0202' on GitHub by visiting:
remote:   https://github.com/learnwithraghu/github-example/pull/new/sprint-01/jira-id-0202
* [new branch]      sprint-01/jira-id-0202 -> sprint-01/jira-id-0202
CommandDescription
git checkout -b <branch-name>Create & switch to a new feature branch
git push origin <branch-name>Push local branch to remote repository
git add .Stage all changes
git commit -m "<message>"Commit staged changes with a message

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Opening a Pull Request

  1. Navigate to your GitHub repository in a browser.
  2. Click Compare & pull request for sprint-01/jira-id-0202.
  3. Add a title and paste your commit message in the description.
  4. Assign a reviewer from your team.
The image shows a GitHub pull request page for a Python application, with details about the branches involved, comments, and options to merge the pull request.
Once the PR is approved, click Merge pull request, then Confirm merge. Finally, switch back to main and pull the latest changes: 
git checkout main
git pull origin main
Your main branch now contains the merged feature.

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Next Steps

With Sprint 01 completed, we’ll proceed to the sprint review—covering objectives, demos, and feedback. Stay tuned!

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