This patch forwards the DISTRO_APT_PREMIRRORS environment variable into
the container when using the kas-container script. This variable is
commonly used to externally set mirrors for debian apt, e.g. in a CI
environment.
Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>