Create a struct to provide build info (#1288)
Create a struct to provide build info (#1288)

* Move buildinfo pkg out of internal.

Intended to share this module with verification server.

* Run goimports over modified files.

* Update additional import paths.

* Also remove an unused module.

* Update build.yaml with the new package location.

* Update variable names in buildinfo and have a struct to export these
values.

* Remove unused file.

* Remove unused interface.

* Fix build error.

* Only export a KeyServer variable instead of a struct.

* Revert most of the changes and only add a new public variable.
google/exposure-notifications-server,google/exposure-notifications-server,google/exposure-notifications-server