build releases for older distros

[mikemccracken]

the released binary is jammy specific:

on focal we see

/data/ssd$ ./atomfs mount
./atomfs: /lib/x86_64-linux-gnu/libcryptsetup.so.12: version `CRYPTSETUP_2.4' not found (required by ./atomfs)
./atomfs: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by ./atomfs)
./atomfs: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by ./atomfs)