For manual steps just write down a description to make a "do-nothing script" [1] to transition with gradual automation .
Then you can turn those into the rough draft of your CI/CD a pipeline.
If you use a common system there might already be adapters for your CI/CD platform of choice to make it even easier.
GitHub Actions is a good simple system to start with if your code is on GitHub.
[1]: https://blog.danslimmon.com/2019/07/15/do-nothing-scripting-...
CI/CD can enable some agile practices for sure, but CI/CD provides a lot of value without implementing any of the agile methodologies. But having CI makes it easier to practice TDD and enforce coding standards. And having a test environment running the latest code should tighten the feedback loop between developer and stakeholder. These are good things no matter how you organise your work. So start with a CI/CD pipeline and then go from there. You may or may not want to adopted ideas from the agile toolbox.
Ps. This isn’t directed at you Maria_micro, more at the implied agile methodologies. “I saw the greatest minds of my generation destroyed by [grooming meetings]”.
Pipelines can only work if everybody strictly sticks to the rules.