feat(cli): add --payload-media-type
to sign
(fixes #4300)
#4304
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Summary
This commit introduces a new
--payload-media-type
flag to thecosign sign
command.When signing with a custom payload using the
--payload
flag, users can now also specify the MIME type of that payload via--payload-media-type
.This media type is then stored in the
mediaType
field of the signature layer descriptor in the resulting OCI manifest. This allows consumers of the signature to correctly interpret the payload's content type.If
--payload
is not used, this flag is ignored.Release Note
cosign sign --payload
hardcodes layer MIME toapplication/vnd.dev.cosign.simplesigning.v1+json
#4300: introduced the--payload-media-type
flag incosign sign
.Documentation
Needs documentation change.