fix vouch#304 add CHANGELOG.md

vouch#406 fix naming of alpine images, update README

Merge branch 'fix/docker_build_push_quay.io'

set cache expiration to jwt expiration

adjust testing environment for go:embed

Merge branch 'master' into pr/gdamjan/398

use github.com/golang-jwt/jwt

vouch#189 adfs relying_party_id minor adjustments

move the #vouch irc channel to libera.chat

vouch#375 use correct error codes, general cleanup