My job is requiring masks again

I work in a school and my superintendent just emailed saying masks are required for all staff and and students starting Monday. He said even though the rest of society has given up on COVID, he is not. We are literally the only district doing it in the entire state, I think. Definitely the only one in our county. I am beyond irate, especially since the weather has just changed to 70-80 degrees in my area and these students have no air conditioning. I already went to my union to find out what would happen if I refuse and I’m waiting for an answer, but they said most likely daily write ups for insubordination until I’m terminated. I do have a child so I need this job, so it’s not an option to risk termination. The good news is most people are also angry and think it’s insane, which is a big difference from even 6 months ago, but everyone is just laying down accepting it angrily. There’s nothing I can do except ride it out until the end of the school year, but I am not calm and I am not ok.