[flux2] support hostAliases for sourceController

[uqix]

Is your feature request related to a problem ?

We use flux in a limited env where we can't control its DNS configuration, and we have a private registry whose name needs to be manually mapped.

Describe the solution you'd like.

Add value sourceController.hostAliases.

Describe alternatives you've considered.

Use Helm post-renderer, which is not so handy.

Additional context.

No response