0.5.1

• fixes:
  • check for gcr.io as domain, as well as for .gcr.io as domain suffix (PR #110)
  • corrected logic for setting GCR refresher, to allow using public GCR without authentication (PR #109)
• upgrades:
  • Go 1.21.6
  • latest Ubuntu 22.04 and Alpine 3.18
  • Skopeo 1.14.1
  • misc. lib upgrades for remediation of CVEs in dependencies
• pre-built binaries for a few architectures are now also provided with each release; however, except for linux_amd64 provided as untested! (#101)