Currently, the `kustomize` index in ElasticSearch is using dynamic
mapping, which sets the types of all the fields to `text`. However,
`text` field type is good for full-text value matching, and not good for
exact-value matching. For exact-value matching, the `keyword` filed
type should be used.
1) add the crawler binary and fix the crawler library
2) remove the readiness probe in the search backend
3) add config for redis keystore
4) add github_api_secret.txt file with instructions
