I usually have a shell script called 'deploy.sh' that does a bunch of git, test, deploy stuff. So part of my development workflow is calling "deploy dev", "deploy staging", and/or "deploy prod" to push any changes to the dev/staging/prod environments.

The script makes sure changes are tagged, committed, and pushed, tests pass, builds and pushes container images, static files, and then rolls out binaries. The rollouts depend on the infrastructure -- it could be something like scp + kill/restart, or a kubectl command, or "gcloud run deploy", etc.

One-step deployments vastly improve the quality of the service because I can test things in real environments quickly, push out patches and bug fixes quickly, keep updates small and bounded, and bonus, I can come back to a codebase months later and not have to re-learn how to roll something out.