Reproducible build with kaniko plugin

[pips-]

Hello!

Thanks a lot for awesome woodpecker-ci!

I was wondering how do I make reproducible build with kaniko plugin?

I noted that original kaniko have a reproducible flag but I'm not sure how I should enable it.

From advanced settings, I thought build-args could be of some help, but it does not seems to be what I was looking for flag, but more for env vars, am I right?

Otherwise I was thinking of using SOURCE_DATE_EPOCH with commit timestamp, but it does not seems woodpecker-ci provide such environment variable, maybe it would be of any interest to add it?

Some pointers to make reproducible OCI builds would be really welcomed!

Thanks again for this great software!