system/kubeovn-webhook: multiarch support

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

packages/system/kubeovn-webhook/Makefile

@@ -7,6 +7,8 @@ include ../../../scripts/package.mk
 image:
 	docker buildx build images/kubeovn-webhook \
 		--provenance false \
+		--builder=$(BUILDER) \
+		--platform=$(PLATFORM) \
 		--tag $(REGISTRY)/kubeovn-webhook:$(call settag,$(TAG)) \
 		--cache-from type=registry,ref=$(REGISTRY)/kubeovn-webhook:latest \
 		--cache-to type=inline \

packages/system/kubeovn-webhook/images/kubeovn-webhook/Dockerfile

@@ -1,11 +1,14 @@
-FROM golang:1.23 as builder
+FROM golang:1.23 AS builder
+
+ARG TARGETOS
+ARG TARGETARCH
 
 WORKDIR /app
 COPY go.mod go.sum ./
-RUN go mod download
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH go mod download
 
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -o webhook .
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o webhook .
 
 FROM alpine:3.21.3
 WORKDIR /app