kata-deploy: smaller guest image file for mariner

Align up the mariner Guest image file size to 2M instead of the
default 128M alignment.

Signed-off-by: Dan Mihai <dmihai@microsoft.com>

tools/packaging/kata-deploy/local-build/kata-deploy-binaries.sh

@@ -436,6 +436,7 @@ install_image_confidential() {
 
 #Install cbl-mariner guest image
 install_image_mariner() {
+	export IMAGE_SIZE_ALIGNMENT_MB=2
 	install_image "mariner"
 }