feat(sign): support loading --cert/--cert-chain from URL and env variable #4260
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… well
Summary
When using
cosign sign,--certand--certificate-chainparameters only accept file path. Same parameters forcosign verifysupports loading from URL as well, usingblob.LoadFileOrURL(fileRef)instead ofos.ReadFile(path). This PR aims to add URL/env support to sign operation as well.Release Note
cosign signnow supports --cert and --certificate-chain to be loaded from URL and environment variable as well as from a file.Documentation