Depends on what kind of career you want to have, but I think for the most part, it could be good experience, depending on the position. Everyone's riding the big SV company bandwagon, so every company is going to be totally different. If you're being brought in to convert applications to run on AWS instead of on premise, or refactoring apps to run in containers instead of VM, you're not an SRE, you're operations, and that's what we call 'lift and shift.' The AWS and container experience will be valuable, but you're probably not going to learn much about software development. You're going to be writing Puppet or Chef modules (or if the company has their act together, ansible), and it's going to mostly suck.

As with anything, you're going to put out what you put in. If you want to be a low-level C programmer, then spend time doing whatever is related to that.