The Rust pm-ca crate (crates/pm-ca/src/ca.rs) only parses PKCS#8
format private keys. openssl ecparam -genkey produces SEC1 format
(BEGIN EC PRIVATE KEY), which the Rust ring/RSA parser rejects
with "parse CA private-key PEM", causing the service to crash-loop
on startup.
Proven on LPM: converting ca.key with openssl pkcs8 -topk8 -nocrypt
and restarting patch-manager-web results in:
Root CA loaded successfully
Listening (HTTPS) on 0.0.0.0:443
4c1db3ebe0