[Feature] Allow for custom path to a language server binary (#1043)

lua/lang/zig.lua

@@ -7,6 +7,9 @@ M.config = function()
       args = { "fmt" },
       stdin = false,
     },
+    lsp = {
+      path = "zls",
+    },
   }
 end
 
@@ -41,6 +44,7 @@ M.lsp = function()
   -- Further custom install zls in
   -- https://github.com/zigtools/zls/wiki/Downloading-and-Building-ZLS
   require("lspconfig").zls.setup {
+    cmd = { O.lang.zig.lsp.path },
     root_dir = require("lspconfig").util.root_pattern(".git", "build.zig", "zls.json"),
     on_attach = require("lsp").common_on_attach,
   }