X.509 Interop Test

[ejohnstown]

• Add a GitHub Actions workflow that builds PKIX-SSH and runs wolfSSHd against the PKIX-SSH ssh/sftp clients to exercise x509 user-certificate auth; runs weekly and on workflow_dispatch.
• Gate wolfSSH/wolfSSL debug logging in wolfsshd behind the -d flag, enabling it on startup and disabling both facilities during cleanup.

[Copilot]

Pull request overview

Adds an automated X.509 interop validation loop to the repo and adjusts wolfSSHd logging behavior so wolfSSH/wolfSSL debug output is only enabled when explicitly requested via -d.

Changes:

• Add a scheduled/manual GitHub Actions workflow to build PKIX-SSH and run ssh/sftp interop tests against wolfSSHd using X.509 user-certificate auth.
• Gate wolfSSL_Debugging_ON() behind the -d flag and add explicit debug shutdown during wolfSSHd cleanup.
• Enable wolfSSH debug logging on -d (currently guarded by DEBUG_WOLFSSH).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
apps/wolfsshd/wolfsshd.c	Moves wolfSSL debug enabling behind -d and adds debug OFF calls during cleanup.
.github/workflows/x509-interop.yml	New weekly/manual CI workflow to build PKIX-SSH + wolfSSL and run X.509 ssh/sftp interop against wolfSSHd.

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