fixes api auth bug in techdocs backend

Signed-off-by: Erik Larsson <erik.larsson@schibsted.com>

.changeset/seven-tomatoes-smash.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-techdocs-backend': minor
+---
+
+fixes api auth bug in techdocs backend

plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts

@@ -123,6 +123,11 @@ export class DefaultTechDocsCollator implements DocumentCollator {
                 techDocsBaseUrl,
                 entityInfo,
               ),
+              {
+                headers: {
+                  Authorization: `Bearer ${token}`,
+                },
+              },
             );
             const searchIndex = await searchIndexResponse.json();