Stalwart v0.15.5 requires %{file:path}% macros to read cert/key
from disk — bare paths were treated as literal content, causing
"No certificates found" errors.
Added HTTPS egress to NetworkPolicy so Stalwart can download the
webadmin bundle and spam/geo databases from GitHub/CDN on boot.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>