feat(nvim): enable helm files editing

Disable yaml diagnostic for 'helm' files based on this Reddit thread
https://www.reddit.com/r/neovim/comments/sqr6r5/helm_charts_for_kubernetes_in_nvim_bad_experience/

And detect helm files according to
https://www.reddit.com/r/neovim/comments/12ub997/how_to_prevent_yaml_ls_from_attaching_to_helm/

Also add vim-helm (https://github.com/towolf/vim-helm) plugin for
syntax highlighting.

.config/nvim/init.lua

@@ -45,3 +45,24 @@ require('lazy').setup('plugins', lazy_config)
 require('core.options')
 require('core.keymaps')
 require('core.autocmds')
+
+--[[
+-- Change file types to helm if a 'Chart.yaml' file is found
+--]]
+local isHelmfile = function(path)
+  local check = vim.fs.find('Chart.yaml', { path = vim.fs.dirname(path), upward = true })
+  return not vim.tbl_isempty(check)
+end
+
+vim.filetype.add({
+  extension = {
+    yaml = isHelmfile and 'helm' or 'yaml',
+    yml = isHelmfile and 'helm' or 'yaml',
+    tmpl = isHelmfile and 'helm' or 'tmpl',
+    tpl = isHelmfile and 'helm' or 'tpl',
+  },
+  filename = {
+    ['Chart.yaml'] = 'yaml',
+    ['Chart.lock'] = 'yaml',
+  },
+})

.config/nvim/lua/plugins/lsp.lua

@@ -44,6 +44,13 @@ return {
 
       nmap('K', vim.lsp.buf.hover, 'Hover Documentation') -- See `:help K` for why this keymap
       nmap('<C-k>', vim.lsp.buf.signature_help, 'Signature Documentation')
+
+      if vim.bo[bufnr].buftype ~= '' or vim.bo[bufnr].filetype == 'helm' then
+        vim.diagnostic.disable(bufnr)
+        vim.defer_fn(function()
+          vim.diagnostic.reset(nil, bufnr)
+        end, 1000)
+      end
     end)
 
     -- https://github.com/williamboman/mason-lspconfig.nvim#available-lsp-servers
@@ -52,6 +59,7 @@ return {
       'diagnosticls',
       'dockerls',
       'gopls',
+      'helm-ls',
       'html',
       'jsonls',
       'lua_ls',

.config/nvim/lua/plugins/vimhelm.lua

@@ -0,0 +1,4 @@
+return {
+  'towolf/vim-helm', -- https://github.com/towolf/vim-helm
+  lazy = false,
+}