It seems the best answer here is to retag the two questions which are about the software release process with an appropriate tag and then retag the rest of the questions currently marked with deployment as content-delivery and when/if I have enough rep to vote on Bart’s synonym suggestion to do so.
We also should probably put a ‘when to use this tag’ section in content-delivery’s tag wiki.
The question then becomes, what is the right tag for the questions about the software release process?
I worry the suggested tags releases software-release and software-builds all have a potential issue that someone think questions with those tags are talking about SDL releases (but I might just be overthinking this.)
This leaves the suggestions from Rob and Alvin of release-process, code-deployment or development-practices I tend to lean towards the latter as it is a little broader in scope and could be used to cover other areas of the SDLC.
EDIT: I retagged the two questions about the release process with release-process, approved and merged the suggested synonym mapping deployment to content-delivery