Specifically, there is no difference between a normal MR being merged to master and the bot commiting an update. The bot committed 229, now you just need to be patient. There is no realistic way to speed that up. It will automatically be build, no need to trigger anything.
Looking at what is currently running, the apps being built are from the cycle before Tuta was updated to 229. So 229 should be build in the next cycle. Meaning that like cliffcoggin said, it will be a week, 4 days if you are lucky. Such is the nature of F-Droid. For hotfixes, ask Tuta to host a repository (like NewPipe does. But then Tuta would also need to migrate to Reproducible Builds ).