sigstore/cosign

Keyless Sigining Verification Fails on Github Self Hosted Runner

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Attaching Attestation and Signature
Generating ephemeral keys...
Error: signing [gcr.io//alpine-jdk8@sha256:0f1878bd210a46fa67485423d478725082a098ed3d9c5174fecb751fbfab384e]: getting signer: getting key from Fulcio: fetching ambient OIDC credentials: Get "&audience=sigstore": unsupported protocol scheme ""
main.go:74: error during command execution: signing [gcr.io/sec-eng-414005/alpine-jdk8@sha256:0f1878bd210a46fa67485423d478725082a098ed3d9c5174fecb751fbfab384e]: getting signer: getting key from Fulcio: fetching ambient OIDC credentials: Get "&audience=sigstore":