(feat): Support ARM builds

 - Modify Dockerfile.konflux to support multi-arch
 - Add arm build config in pull-request pipeline

Author: AjayJagan

.tekton/odh-codeflare-operator-pull-request.yaml

@@ -47,6 +47,7 @@ spec:
   - name: build-platforms
     value:
     - linux/x86_64
+    - linux-m2xlarge/arm64
   - name: image-expires-after
     value: 5d
   pipelineRef:

Dockerfile.konflux

@@ -1,5 +1,8 @@
 FROM registry.access.redhat.com/ubi9/go-toolset:1.23@sha256:381fb72f087a07432520fa93364f66b5981557f1dd708f3c4692d6d0a76299b3 AS builder
 
+ARG TARGETOS
+ARG TARGETARCH
+
 WORKDIR /workspace
 
 # Copy the Go Modules manifests
@@ -21,7 +24,7 @@ RUN git config --global --add safe.directory /workspace
 # Build
 USER root
 
-RUN CGO_ENABLED=1 GOOS=linux GOARCH=amd64 GOEXPERIMENT=strictfipsruntime go build -tags strictfipsruntime -a -o manager main.go
+RUN CGO_ENABLED=1 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH:-amd64} GOEXPERIMENT=strictfipsruntime go build -tags strictfipsruntime -a -o manager main.go
 
 FROM registry.redhat.io/ubi9/ubi-minimal@sha256:e6b39b0a2cd88c0d904552eee0dca461bc74fe86fda3648ca4f8150913c79d0f
 WORKDIR /
@@ -38,4 +41,4 @@ LABEL com.redhat.component="odh-codeflare-operator-container" \
       io.openshift.expose-services="" \
       io.k8s.display-name="odh-codeflare-operator-container" \
       io.k8s.description="odh-codeflare-operator" \
-      com.redhat.license_terms="https://www.redhat.com/licenses/Red_Hat_Standard_EULA_20191108.pdf"
+      com.redhat.license_terms="https://www.redhat.com/licenses/Red_Hat_Standard_EULA_20191108.pdf"