* Set output for the error message
In the event vault-action throws an error, the error message is
sent to the workflow log when with core.setFailed, but that output
is not accessible to other steps in the workflow.
This change sets an output for the error message, called errorMessage,
than can be read by other steps within the workflow and parsed.
* Add hashicorp/vault-action#446 to improvements in CHANGELOG
* chore: make vault action consumable
* fix prefixless queries to default to data
* fix the right build entrypoint
* make output more forgiving and shore up selectors
* clarify doc language
* add npmtoken