Merge pull request #6071 from andrewthauer/techdocs-custom-docker

feat(techdocs-common): add custom docker image support

app-config.yaml

@@ -101,8 +101,10 @@ organization:
 # https://backstage.io/docs/features/techdocs/how-to-guides#how-to-migrate-from-techdocs-basic-to-recommended-deployment-approach
 techdocs:
   builder: 'local' # Alternatives - 'external'
-  generators:
-    techdocs: 'docker' # Alternatives - 'local'
+  generator:
+    runIn: 'docker'
+    # dockerImage: my-org/techdocs # use a custom docker image
+    # pullImage: true # or false to disable automatic pulling of image (e.g. if custom docker login is required)
   publisher:
     type: 'local' # Alternatives - 'googleGcs' or 'awsS3' or 'azureBlobStorage' or 'openStackSwift'. Read documentation for using alternatives.