Add more robust handling of generated certs in mock server

[segiddins]

Summary

Adds support for CSRs in mock server, also correctly translates GH Actions claims to x509 extensions.

Release Note

Documentation

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1b1d39e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[bdehamer]

Closing this in favor of:

• Fix body encoding in mock Rekor server #1318
• Fulcio mock support for all GH claims #1319
• CSR support in Fulcio mock #1321

Thanks @segiddins for the contributions!