OAuth2 providers with no signing_key fall back to HS256, which RS256-only
RP clients (argocd confirmed, and the rest) reject with "unexpected
signature algorithm HS256; expected [RS256]", breaking OIDC login.
- Add data.authentik_certificate_key_pair.signing, resolving the estate's
RSA keypair by name (var.oauth2_signing_key_name, default the built-in
"authentik Self-signed Certificate").
- Default every provider's signing_key to that keypair via coalesce, so all
providers sign with RS256 while keeping the per-yaml signing_key override.
Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv
unkinben