s390x: revise Makefile for building fedora binaries

Fixes: confidential-containers#1640

Signed-off-by: Qi Feng Huo <[email protected]>

podvm-mkosi/Makefile

@@ -1,4 +1,6 @@
-AA_KBC ?= offline_fs_kbc
+AA_KBC ?= offline_fs_kbc
+ARCH ?= $(subst x86_64,amd64,$(shell uname -m))
+BUILDER = fedora-binaries-builder-$(ARCH)
 
 .DEFAULT_GOAL := all
 .PHONY: all
@@ -9,19 +11,30 @@ debug: fedora-binaries-builder binaries image-debug
 
 PHONY: fedora-binaries-builder
 fedora-binaries-builder:
- @echo "Building fedora-binaries-builder image..."
+ @echo "Building $(BUILDER) image..."
+ifeq ($(ARCH),s390x)
  docker buildx build \
- -t fedora-binaries-builder \
+ -t $(BUILDER) \
+ --build-arg ARCH=s390x \
+ --build-arg PROTOC_ARCH=s390x_64 \
+ --build-arg YQ_ARCH=s390x \
+ --build-arg YQ_CHECKSUM=sha256:4e6324d08630e7df733894a11830412a43703682d65a76f1fc925aac08268a45 \
  --load \
  -f ../podvm/Dockerfile.podvm_builder.fedora ../.
+else
+ docker buildx build \
+ -t $(BUILDER) \
+ --load \
+ -f ../podvm/Dockerfile.podvm_builder.fedora ../.
+endif
 
 PHONY: binaries
 binaries:
  docker buildx use default
  @echo "Building binaries..."
  rm -rf ./resources/binaries-tree
  docker buildx build \
- --build-arg BUILDER_IMG=fedora-binaries-builder \
+ --build-arg BUILDER_IMG=$(BUILDER) \
  --build-arg AA_KBC=$(AA_KBC) \
  -o type=local,dest="./resources/binaries-tree" \
  -f ../podvm/Dockerfile.podvm_binaries.fedora ../.