Describe your deployment pipeline & what you like and don't

I'm looking to implement a new fast and easy deployment pipeline for a company, and was wondering how startups are building theirs.

I used to work with a simple pipeline:

• CI on pull requests
• auto deploy on staging when merged to main branch
• one-click deploy to production from custom tooling

What I liked about it was the ability to see exactly what you were deploying (difference in commits between what was in prod and what was in staging).