I’m wondering what would be necessary to build GrapheneOS releases yourself, and regularly update your phone from your own servers, with your builds. The server for apps.grapheneos.org should also be replaced. Has anyone done this?
The documentation for GrapheneOS has a section about how to reproduce builds:
https://grapheneos.org/build#reproducible-builds
But it would be more involved than that.
I’ve only built and ran their emulator. But, The first build will take a lot of time but subsequent builds are fast.
Keep in mind Google is not releasing source code regularly like they used to. And GrapheneOS has a OEM partner from them they get latest source code but not allowed to release for some time so build will not have latest updates