Are Bazzite builds reproducible?

Are Bazzite builds reproducible? IOW, is there a way I can take the source code and build it myself to generate output that matches the pre-built downloads exactly?

Builds are only reproducible if the state of upstream is the same at time of build. Instead, if you need an exact build, utilizing GitHub’s 90 days of images is the best way to ensure you have the same build across multiple machines.