ci: check for presence of GPG_KEYS when signing publications

refactor: add checknotnull on nullable values

Proxy aware urls in wellknown document (navikt#22)

* feat: support running behind a proxy by using host header and x-forwarded-for when creating well known doc
Co-authored-by: @jksolbakken

add keyUse to public jwks (navikt#20)

Update README.md

ci: correct registry

ci: update release-drafter.yml

ci: gpg again..

fix mainclass reference after refactoring

ensure server is using localhost when no address i specified. add mor…

…e tests, including verifying tokens issued by the server