This patch introduces new and improved ways to overwrite kas-container
variables that specify which image should be used.
`KAS_CONTAINER_IMAGE_PREFIX`: can be used to overwrite image sources.
For instance if podman is used, the default value `docker://` is used as
a prefix. But it still allows to overwrite it, by setting a custom
variable.
`KAS_CONTAINER_IMAGE_PATH`: can be used to customize the image source
path.
`KAS_CONTAINER_IMAGE_NAME`: can be set to change the container image
name. For instance if `--isar` is used, the default value is
`kas-isar`, as with `KAS_CONTAINER_IMAGE_PREFIX` this default value can
still be overwritten by setting a custom value.
And last `KAS_IMAGE_VERSION`: It was possible to overwrite this value
before this patch and its still possible. The default value is the
current release version. Setting it for instance to `latest`, would
allow to used the most recent version of the image.
Signed-off-by: Claudius Heine <ch@denx.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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