gha: add signed cache support #6397
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Signed-off-by: Tonis Tiigi <[email protected]>
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Signed-off-by: Tonis Tiigi <[email protected]>
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Add an option to use signed cache with Github backend. Signing needs to happen by an external program set in the toml config (eg. cosign via github OIDC) and is verified against the policy specified in the toml config. This allows reusable workflow running in Github actions environment to ensure that cache can not be modified outside of the workflow, even if full access to cache storage is available.
ref docker/github-builder-experimental#56