feat(cli): add --payload-media-type to sign (fixes #4300)
#4304
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Summary
This commit introduces a new
--payload-media-typeflag to thecosign signcommand.When signing with a custom payload using the
--payloadflag, users can now also specify the MIME type of that payload via--payload-media-type.This media type is then stored in the
mediaTypefield 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
--payloadis not used, this flag is ignored.Release Note
cosign sign --payloadhardcodes layer MIME toapplication/vnd.dev.cosign.simplesigning.v1+json#4300: introduced the--payload-media-typeflag incosign sign.Documentation
Needs documentation change.