fix: use DEFAULT_TAG when renaming rechunked image in CI

Fixes secureboot check exit code 125 due to tag mismatch.

Author: dylanmtaylor

Justfile

@@ -319,7 +319,7 @@ rechunk $image="bluefin" $tag="latest" $flavor="main" ghcr="0" pipeline="0" prev
 
     # rename the image to localhost
     if [[ "{{ ghcr }}" == "1" && "{{ previous_build }}" == "1" ]]; then
-      ${SUDOIF} ${PODMAN} tag ${CHUNKED_IMAGE} "localhost/${image_name}:${tag}"
+      ${SUDOIF} ${PODMAN} tag ${CHUNKED_IMAGE} "localhost/${image_name}:${DEFAULT_TAG}"
       ${SUDOIF} ${PODMAN} image rm -f ${CHUNKED_IMAGE}
     fi