Bump sigstore-go to v0.3.0 and add local registry for tests #3154
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Summary
This commit bumps the sigstore library to v0.3.0 which had a small breaking change.
For now, I added an internal constant for the sigstore media types replacing the constants that were removed from sigstore-go but added a new method to build the constants in sigstore/sigstore-go#154 . Once that change gets released I'll remove the internal consts.
This PR also adds a local registry to the test workflow to unit-test all OCI related functions (this PR includes one such test).
Supersedes #3062
Change Type
Mark the type of change your PR introduces:
Testing
This PR modifies the test workflow to spin up a registry and adds a test for the sigstore bundle function. The registry is will be available during the test workflow on localhost:5000
The PR also includes the tarred layouts of a signed image used as fixtures for testing the sigstore functions.
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