feat: gh-actions-language-server

Author: disrupted

lua/lspconfig/configs/gh_actions_ls.lua

@@ -0,0 +1,23 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'gh-actions-language-server', '--stdio' },
+    filetypes = { 'yaml.github' },
+    root_dir = util.root_pattern('.github', '.git'),
+    single_file_support = true,
+  },
+  docs = {
+    description = [[
+https://github.com/lttb/gh-actions-language-server
+
+Language server for GitHub Actions.
+
+`gh-actions-language-server` can be installed via `npm`:
+
+```sh
+npm install -g gh-actions-language-server
+```
+]],
+  },
+}