It seems like you may not have much experience working in groups of people.

>... Is nobody in charge on the team?

This isn't how things work. You save your "you MUST do these things" for special rare instructions. A complex series of checks for code format/lint/various tests... well that can all be automated away.

And you just don't get large groups of people all following the same series of steps several times a day, particularly when the steps change over time. It doesn't matter how "in charge" anybody is, neither the workplace nor an open source project are army boot camp. You won't get compliance and trying to enforce it will make everybody hate you and turn you into an asshole.

Automation makes our lives simpler and higher quality, particularly CI checks. They're such an easy win.