[dev] Allow for building production assets (#67230)

* Also allows passing through watch

Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>

src/cli/cluster/run_kbn_optimizer.ts

@@ -33,9 +33,10 @@ import { LegacyConfig } from '../../core/server/legacy';
 export function runKbnOptimizer(opts: Record<string, any>, config: LegacyConfig) {
   const optimizerConfig = OptimizerConfig.create({
     repoRoot: REPO_ROOT,
-    watch: true,
+    watch: !!opts.watch,
     includeCoreBundle: true,
     cache: !!opts.cache,
+    dist: !!opts.dist,
     oss: !!opts.oss,
     examples: !!opts.runExamples,
     pluginPaths: config.get('plugins.paths'),

src/cli/serve/serve.js

@@ -213,6 +213,7 @@ export default function(program) {
       .option('--dev', 'Run the server with development mode defaults')
       .option('--open', 'Open a browser window to the base url after the server is started')
       .option('--ssl', 'Run the dev server using HTTPS')
+      .option('--dist', 'Use production assets from kbn/optimizer')
       .option(
         '--no-base-path',
         "Don't put a proxy in front of the dev server, which adds a random basePath"
@@ -255,6 +256,7 @@ export default function(program) {
         optimize: !!opts.optimize,
         oss: !!opts.oss,
         cache: !!opts.cache,
+        dist: !!opts.dist,
       },
       features: {
         isClusterModeSupported: CAN_CLUSTER,