The 'static deployment manifests' are generated automatically from the official helm chart.
When a new release of external-secrets is cut, these manifests will be automatically generated and published as an asset attached to the GitHub release.
If you want to build a copy of your own manifests for testing purposes, you can do so using Helm and Make.
To build the manifests, run:
make manifests
This will generate the static deployment manifests at
bin/deploy/manifests/external-secrets.yaml.