nvim: lsp: add LS for YAML

.config/nvim/lua/my/lsp.lua

@@ -235,6 +235,13 @@ if vim.fn.executable('typescript-language-server') > 0 then
     })
 end
 
+if vim.fn.executable('yaml-language-server') > 0 then
+    lspconfig.yamlls.setup({
+        on_attach = on_attach,
+        capabilities = capabilities
+    })
+end
+
 require('lsp-format').setup({
     sync = true -- seems to be needed to not interfere with Neogit
 })