matt-demers

Allow for customizable security context in the ratify deployment

2

### What would you like to be added? The ratify helm chart hardcodes a security context in the ratify [deployment yaml](https://github.com/notaryproject/ratify/blob/main/charts/ratify/templates/deployment.yaml). Namely, it hardcodes `readOnlyRootFilesystem: false`, which does not follow...