Add remark about the CI steps being opinionated

[github-learning-lab]

Add remark about the CI steps being opinionated

The list used in this course is opinionated, we should add a remark stating this.

⌨️ Activity: Create a pull request for the remark

1. Check out master branch.
2. Create a branch named bugfix-remark.
3. Add the remark text at the bottom of ci.md.

> **GitHub flow** is sometimes used as a nickname to refer to a flavor of trunk-based development  
  when code is deployed straight from feature branches. This list is just an interpretation  
  that I use in my [DevOps courses](http://redpill.solutions).  
  The official tutorial is [here](https://guides.github.com/introduction/flow/).

4. Commit the changes.
5. Push branch bugfix-remark to the remote.
6. Open a pull request named Adding a remark with head branch bugfix-remark and base branch master.

Show the commands...

# Check out master branch. Create a branch named bugfix-remark.
git checkout master

# Create a branch named bugfix-remark.
git checkout -b bugfix-remark

# Add the remark text at the bottom of ci.md.

# Commit the changes
git add ci.md
git commit -m "Add remark about the list being opinionated"

# Push branch bugfix-remark to the remote.
git push --set-upstream origin bugfix-remark

# Open a pull request using GitHub UI as described above