cli: add missing --format option to config:schema.

Signed-off-by: Andreas Stenius <andreas.stenius@svenskaspel.se>

docs/cli/commands.md

@@ -501,9 +501,9 @@ Usage: backstage-cli config:schema [options]
 Print configuration schema
 
 Options:
-  --package <name>  Only output config schema that applies to the given package
-  -h, --help        display help for command
-
+  --package <name>   Only output config schema that applies to the given package
+  --format <format>  Format to print the schema in, either json or yaml [yaml]
+  -h, --help         display help for command
 ```
 
 ## versions:bump

packages/cli/src/commands/index.ts

@@ -176,6 +176,10 @@ export function registerCommands(program: CommanderStatic) {
       '--package <name>',
       'Only output config schema that applies to the given package',
     )
+    .option(
+      '--format <format>',
+      'Format to print the schema in, either json or yaml [yaml]',
+    )
     .description('Print configuration schema')
     .action(lazy(() => import('./config/schema').then(m => m.default)));