Add support for the EJBCA UpstreamAuthority plugin, allowing the SPIRE
server to use an EJBCA instance as its upstream CA over mTLS.
- Add upstreamAuthority.ejbca values (hostname, caName, endEntityProfileName,
certificateProfileName, optional endEntityName and accountBindingId).
- Render the ejbca UpstreamAuthority block in the server config and count it
toward the single-upstream-authority guard.
- Mount the mTLS client credentials (and optional CA cert) from a secret,
either chart-created (secret.create) or externally provided.
- Gate ca_cert_path on secret.data.caCert, mirroring the disk plugin's bundle
handling for deterministic rendering.
- Regenerate the chart README and add a unit render test.
Signed-off-by: sabsari <[email protected]>
Co-authored-by: Claude Opus 4.8 <[email protected]>
