Yes we had nightly builds but they were broken for quite a while since I was too busy to fix them. Also they haven't been on the Downloads page anywhere anymore for even longer.
I have now fixed the build so new builds will appear at https://redfortune.de/openmw/nightly/ again.
Had to move the build system away from CentOS 7 since even the latest devtoolsets compiler is too old to build current openmw. The build system is now based on Debian Bookworm and hopefully will last at least as long as the old one did.