feat: permit multiple ca_certificates #1629
Description
Feature Request
Motivation
Sometimes there are multiple ca's to be added to the trust store. For instance, when migrating between setups (e.g. going from an internal manual CA to a SPIRE setup). Having only one ca_certificate means a flag-day event is required rather than permitting graceful migration component by component.
Proposal
Change the config builder to have a list of ca's to add; change the ca_certificate call to appends to the vector.