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M11.4: sign exact release digest with GitHub OIDC - #4

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pgousdal merged 2 commits into
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work/m11.4-signed-release-evidence
Sep 5, 2026
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pgousdal merged 2 commits into
mainfrom
work/m11.4-signed-release-evidence

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@pgousdal pgousdal commented Sep 5, 2026

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Adds keyless Sigstore/Cosign signing for the immutable OCI digest emitted by the release build. The workflow installs Cosign from an immutable action commit, signs the exact ghcr.io/ploos-as/soju-web@sha256:... subject with GitHub Actions OIDC, immediately verifies issuer and release-workflow identity, and only then creates the GitHub Release. Documentation records the fail-closed signed-evidence gate.

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pgousdal merged commit 76b01ae into main Sep 5, 2026
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pgousdal deleted the work/m11.4-signed-release-evidence branch September 5, 2026 16:16
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