nixpkgs/neovim: add solargraph lsp

.config/nixpkgs/neovim/lsp.lua

@@ -89,6 +89,12 @@ if vim.fn.executable("node_modules/.bin/tsc") == 1 then
   })
 end
 
+if vim.fn.executable("solargraph") == 1 then
+  nvim_lsp.solargraph.setup({
+    on_attach = on_attach,
+  })
+end
+
 local group = vim.api.nvim_create_augroup('LspFormatting', { clear = false })
 
 null_ls.setup({