Add addEntityProvider method to catalog extension

Signed-off-by: Johan Haals <johan.haals@gmail.com>

plugins/catalog-backend/src/service/CatalogPlugin.ts

@@ -28,18 +28,28 @@ import {
   CatalogProcessor,
   CatalogProcessingExtensionPoint,
   catalogProcessingExtentionPoint,
+  EntityProvider,
 } from '@backstage/plugin-catalog-node';
 
 class CatalogExtensionPointImpl implements CatalogProcessingExtensionPoint {
   #processors = new Array<CatalogProcessor>();
+  #entityProviders = new Array<EntityProvider>();
 
   addProcessor(processor: CatalogProcessor): void {
     this.#processors.push(processor);
   }
 
+  addEntityProvider(provider: EntityProvider): void {
+    this.#entityProviders.push(provider);
+  }
+
   get processors() {
     return this.#processors;
   }
+
+  get entityProviders() {
+    return this.#entityProviders;
+  }
 }
 
 /**
@@ -82,6 +92,7 @@ export const catalogPlugin = createBackendPlugin({
           logger: winstonLogger,
         });
         builder.addProcessor(...processingExtensions.processors);
+        builder.addEntityProvider(...processingExtensions.entityProviders);
         const { processingEngine, router } = await builder.build();
 
         await processingEngine.start();

plugins/catalog-node/src/extensions.ts

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 import { createServiceRef } from '@backstage/backend-plugin-api';
+import { EntityProvider } from './api';
 import { CatalogProcessor } from './api/processor';
 
 /**
@@ -21,6 +22,7 @@ import { CatalogProcessor } from './api/processor';
  */
 export interface CatalogProcessingExtensionPoint {
   addProcessor(processor: CatalogProcessor): void;
+  addEntityProvider(provider: EntityProvider): void;
 }
 
 /**