Sign an image with an ECDSA private key (PEM) and attach the cosign-compatible signature to it via the Referrers API.
mix stevedore.sign REF --key path/to/key.pem [--scheme http|https]
Sign an image with an ECDSA private key (PEM) and attach the cosign-compatible signature to it via the Referrers API.
mix stevedore.sign REF --key path/to/key.pem [--scheme http|https]