cli: allow running with no configuration files

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>
Signed-off-by: MT Lewis <mtlewis@users.noreply.github.com>

packages/cli/src/lib/bundler/config.ts

@@ -48,8 +48,12 @@ const BUILD_CACHE_ENV_VAR = 'BACKSTAGE_CLI_EXPERIMENTAL_BUILD_CACHE';
 
 export function resolveBaseUrl(config: Config): URL {
   const baseUrl = config.getOptionalString('app.baseUrl');
+
   try {
-    return new URL(baseUrl ?? '/', 'http://localhost:3000');
+    return new URL(
+      baseUrl ?? '/',
+      `http://localhost:${process.env.PORT ?? '3000'}`,
+    );
   } catch (error) {
     throw new Error(`Invalid app.baseUrl, ${error}`);
   }

packages/cli/src/lib/config.ts

@@ -96,11 +96,13 @@ export async function loadCliConfig(options: Options) {
     },
   });
 
+  const configurationLoadedMessage = appConfigs.length
+    ? `Loaded config from ${appConfigs.map(c => c.context).join(', ')}`
+    : `No configuration files found, running without config`;
+
   // printing to stderr to not clobber stdout in case the cli command
   // outputs structured data (e.g. as config:schema does)
-  process.stderr.write(
-    `Loaded config from ${appConfigs.map(c => c.context).join(', ')}\n`,
-  );
+  process.stderr.write(`${configurationLoadedMessage}\n`);
 
   try {
     const frontendAppConfigs = schema.process(appConfigs, {