chore: update Dockerfile images for Konflux (#13)

Signed-off-by: Alberto Falossi <afalossi@redhat.com>

Author: falox

Dockerfile

@@ -1,4 +1,5 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.22-openshift-4.17 AS builder
+FROM brew.registry.redhat.io/rh-osbs/openshift-golang-builder:rhel_9_1.22 as builder
+ARG TARGETARCH
 
 WORKDIR /src
 COPY go.mod go.mod
@@ -9,13 +10,17 @@ COPY cmd cmd
 COPY pkg pkg
 COPY main.go main.go
 
-ENV GOOS=linux
+ENV GOOS=${TARGETOS:-linux}
+# GOARCH has no default, so the binary builds for the host. On Apple M1, BUILDPLATFORM is set to 
+# linux/arm64; on Apple x86, it's linux/amd64. Leaving it empty ensures the container and binary 
+# match the host platform.
+ENV GOARCH=${TARGETARCH}
 ENV CGO_ENABLED=1
 ENV GOFLAGS=-mod=readonly
 ENV GOEXPERIMENT=strictfipsruntime
 RUN go build -tags strictfipsruntime -o /bin/cluster-health-analyzer
 
-FROM registry.ci.openshift.org/ocp/4.17:base-rhel9
+FROM registry.redhat.io/rhel9-2-els/rhel:9.2
 
 WORKDIR /
 COPY --from=builder /bin/cluster-health-analyzer /bin/cluster-health-analyzer