fix(zls): include `build.zig` in root dir search (#2933)

File `build.zig` by convention sits at the root dir and thus can be used
to correctly identify the root directory.

This is particularly useful if `zls` has `enable_build_on_save` set to
`true`, since then the language server uses workspace path (root_dir) to
execute `zig build` command, output of which is then used to publish
diagnostic errors.

Without `build.zig` root directory can incorrectly be deduced some
layers too high at the root of the git repo. In such case
`enable_build_on_save` silently fails and does not report build error
diagnostics.

0 files changed, 0 insertions, 0 deletions