While it's a great perk to be able to work on what one is most passionate about, while on the clock your focus should be to apply your skills, and learning time

While it's a great perk to be able to work on what one is most passionate about, while on the clock your focus should be to apply your skills, and learning time, to bring the most value to your employer. Embrace the devops engineering for now - at least until you change jobs, if that's what it comes down to. See it as a great learning opportunity.