elf files for bootloaders

It's helpful to have the production bootloader `*.hex` files in the repo, however, what I am missing right now are the corresponding `*.elf` files.

Knowing the addresses of the symbols defined in a bootloader from its elf file would allow accessing SPM functionality directly from within a sketch (e.g., for writing flash memory pages etc.).

Would it be possible to include those files in the repo?

Start by inspecting how the repository builds and includes the production bootloader *.hex files. Determine where those artifacts are generated and whether the corresponding *.elf files can be retained with their symbol addresses. Done means the requested production bootloader ELF files are present in the repository and usable for locating SPM symbols; no files or tests are named in the issue.

Written by the indexing model from the issue text.