[buildah] Remove privileged: true by adding SETFCAP cap

[jsalatiel]

The buildah task has privileged: true set in its pod securityContext

That can be replaced by

securityContext:
  capabilities:
     add:
     - SETFCAP

and the build will work without needing privileged which sometimes is not allowed in the cluster.

Tested in k8s 1.30 running crio 1.30

[nnWhisperer]

I came here to write that it must be modified, thank you for sharing the correct response