fix: Adding in yamlls setup with the newer lspconfig arrangement

nvim/after/lsp/yamlls.lua

@@ -1,6 +1,11 @@
 -- YAML LSP specific settings with a number of custom tags specifically for use with AWS CloudFormation templates
 
 return {
+    cmd = function (dispatchers, _)
+        return vim.lsp.rpc.start({'yaml-language-server', '--stdio'}, dispatchers)
+    end,
+    filetypes = { 'yaml', 'yaml.docker-compose', 'yaml.gitlab', 'yaml.helm-values' },
+    root_markers = { '.git' },
     settings = {
         redhat = { telemetry = { enabled = false } },
         yaml = {
@@ -29,5 +34,13 @@ return {
             schemaStore = { enable = true },
             validate = true,
         }
-    }
+    },
+    on_init = function(client)
+        -- From nvim-lspconfig's yamlls.lua
+        --- https://github.com/neovim/nvim-lspconfig/pull/4016
+        --- Since formatting is disabled by default if you check `client:supports_method('textDocument/formatting')`
+        --- during `LspAttach` it will return `false`. This hack sets the capability to `true` to facilitate
+        --- autocmd's which check this capability
+        client.server_capabilities.documentFormattingProvider = true
+    end,
 }