software/gitlab: don't install ed25519 for debian 12 compatibility

This uses rbnacl-sodium which bundle an old version of libsodium that
can not be compiled with gcc 12. This is an optional dependency to
support ed25519 ssh keys, but we the slapos version of gitlab does not
use ssh, only https, so we don't actually need to install this.

software/gitlab/software.cfg

@@ -187,7 +187,7 @@ configure-command = cd ${:path} &&
 
 make-binary =
 make-targets= cd ${:path} &&
-    ${:bundle} install --deployment  --without development test mysql aws kerberos
+    ${:bundle} install --deployment  --without development test mysql aws kerberos ed25519
 environment =
   PKG_CONFIG_PATH=${openssl-1.0:location}/lib/pkgconfig:${re2:location}/lib/pkgconfig:${xz-utils:location}/lib/pkgconfig
   PATH=${pkgconfig:location}/bin:%(PATH)s