Add gitweb lister pod

make helm-diff is ok but shows too much since production and staging are a bit diverged currently (so not shown here)

Refs. swh/infra/sysadm-environment#4984 (closed)

Depends on !93 (merged)

swh/values/staging.yaml

@@ -19,6 +19,7 @@ storagePipelineSteps:
   - cls: retry
 
 storagePipelineStepsWithRecordReferences:
+  - *bufferStorage
   - cls: filter
   - cls: retry
   - cls: record_references