Devops is agnostic to which tool you use. The same ideas apply regardless if you use RPMs, Docker containers, VM images, ... as the format to deliver apps. (remember, the term is from 2009, and that was just when the catchy label was attached, not when people started doing these things, I'm sure good teams did things the label is appropriate for in 90s too)
"Devops" is nothing more than making "developers" responsible for supporting the mess they "release", because the model of them just shrugging off all responsibility for support, and the sysadmins (2nd level support) being stuck with the fallout was unsustainable. That's the long and short of it.
