fix: change externalAccess to optional

Signed-off-by: mario ma <mario.ma.node@gmail.com>

.changeset/mighty-days-kiss.md

@@ -0,0 +1,6 @@
+---
+'@backstage/backend-defaults': patch
+'@backstage/backend-app-api': patch
+---
+
+change externalAccess to optional

packages/backend-app-api/config.d.ts

@@ -71,7 +71,7 @@ export interface Config {
        * the Backstage ecosystem to get authorized for access to APIs that do
        * not permit unauthorized access.
        */
-      externalAccess: Array<
+      externalAccess?: Array<
         | {
             /**
              * This is the legacy service-to-service access method, where a set

packages/backend-defaults/config.d.ts

@@ -74,7 +74,7 @@ export interface Config {
        * the Backstage ecosystem to get authorized for access to APIs that do
        * not permit unauthorized access.
        */
-      externalAccess: Array<
+      externalAccess?: Array<
         | {
             /**
              * This is the legacy service-to-service access method, where a set