[Potential improvement] Reduce binary size of rust data server

[Corwinpro]

I think there might be an easy win to reduce the size of the rustboard binary, by about 30%. We could just strip some debug symbols and stuff from the release build, as you can see here: #6765

FWIW on my M1 machine, the build went down from 14Mb to 9.5Mb.

Also, please let me know if the build process is different from the one I assumed (cargo build --release), and that change is not relevant.

[bileschi]

Fixed via #6765. Thanks!