build: Allow passing IMAGE_SIZE_ALIGNMENT_MB as an env var

This helps considerably to avoid patching the code, and just adjusting
the build environment to use a smaller alignment than the default one.

Signed-off-by: Fabiano Fidêncio <fidencio@northflank.com>

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

@@ -150,6 +150,7 @@ docker run \
 	--env REPO_COMPONENTS="${REPO_COMPONENTS}" \
 	--env AGENT_POLICY="${AGENT_POLICY}" \
 	--env RUNTIME_CHOICE="${RUNTIME_CHOICE}" \
+	--env IMAGE_SIZE_ALIGNMENT_MB="${IMAGE_SIZE_ALIGNMENT_MB}" \
 	--env AA_KBC="${AA_KBC:-}" \
 	--env HKD_PATH="$(realpath "${HKD_PATH:-}" 2> /dev/null || true)" \
 	--env SE_KERNEL_PARAMS="${SE_KERNEL_PARAMS:-}" \