Trivy redis connection support redis TLS mode

[MinerYang]

Could trivy-adatper support Redis TLS mode and related configurations in the coming release that consumers like Harbor could fulfill the redisTLS requirements as one of the components.

Current scanner-trivy seems not allow us config redisTLS.

• harbor-scanner-trivy/pkg/etc/config.go

  Line 68 in 47f8aab

  type RedisPool struct {

• harbor-scanner-trivy/pkg/redisx/pool.go

  Line 27 in 47f8aab

  switch configURL.Scheme {

[zyyw]

rediss:// vs redis://

[knqyf263]

I'm looking to add three options.

• redis-ca
• redis-cert
• redis-key

https://aquasecurity.github.io/trivy/v0.48/docs/configuration/cache/#cache-backend

Does it work for you? @MinerYang

[knqyf263]

I've added CA cert support in #430. If we need client auth, we can add it later.