test: add local registry sync e2e - #106

sync.init calls signature.init, which eventually calls errors.init

docker.RunOnce calls errors.UnsupportedError.Error

docker.RunOnce calls errors.UnknownPacketTypeError.Error

docker.RunOnce calls errors.StructuralError.Error

docker.RunOnce calls errors.SignatureError.Error

docker.RunOnce calls errors.InvalidArgumentError.Error

sync.init calls signature.init, which eventually calls elgamal.init

sync.push calls copy.Image, which eventually calls elgamal.Encrypt

sync.push calls copy.Image, which eventually calls elgamal.Decrypt

sync.init calls signature.init, which eventually calls armor.init

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Both go-version and go-version-file inputs are specified, only go-version will be used