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The document Containers on Summit says "Singularity also allows building images but ordinary users cannot utilize that on Summit due to additional permissions not allowed for regular users" but that must not be true. Since you have set up /etc/subuid and /etc/subgid for users, all you need is the singularity build --fakeroot command.
In addition, beginning in Apptainer 1.1.0 thanks to a recently merged PR containers will be able to be built by unprivileged users even without /etc/subuid and /etc/subgid.