• Add lsp and zig to dotspacemacs-configuration-layers in your .spacemacs file.
• If you don’t have zig or zls in your PATH, add the following to dotspacemacs/user-config in your .spacemacs file:

(setq lsp-zig-zls-executable "/path/to/zls_executable")
(setq lsp-zig-zig-exe-path "/path/to/zig_executable")