apps/mysql: multiarch support

Signed-off-by: nbykov0 <166552198+nbykov0@users.noreply.github.com>

packages/apps/mysql/Makefile

@@ -9,6 +9,8 @@ generate:
 image:
 	docker buildx build --platform linux/amd64 --build-arg ARCH=amd64 images/mariadb-backup \
 		--provenance false \
+		--builder=$(BUILDER) \
+		--platform=$(PLATFORM) \
 		--tag $(REGISTRY)/mariadb-backup:$(call settag,$(MARIADB_BACKUP_TAG)) \
 		--cache-from type=registry,ref=$(REGISTRY)/mariadb-backup:latest \
 		--cache-to type=inline \