Support alpine 3.19 and up

[hieuk09]

Context

We use RbNaCl with Alpine 3.19 and we see the below errors

#40 7.090 Could not open library 'libsodium.so': Error loading shared library libsodium.so: No such file or directory.

#40 7.090 Could not open library 'libsodium.so.18': Error loading shared library libsodium.so.18: No such file or directory.

#40 7.090 Could not open library 'libsodium.so.23': Error loading shared library libsodium.so.23: No such file or directory.

After looking into the content of Alpine, it looks like the file is now libsodium.so.26.

[joemiller]

Just came here to note that folks using Wolfi-OS / Chainguard based images might also run into this since they also upgraded to libsodium-1.0.20 which ships libsodium.so.26. A quick fix in that case is to install libsodium-dev which creates a symlink for libsodium.so to the .so.26 file.