Build platform independent binary based on the target platform (#1549)

Author: mkumatag

Dockerfiles/Dockerfile

@@ -38,7 +38,7 @@ COPY main.go main.go
 COPY pkg/ pkg/
 
 # Build
-RUN CGO_ENABLED=${CGO_ENABLED} GOOS=linux GOARCH=amd64 go build -a -o manager main.go
+RUN CGO_ENABLED=${CGO_ENABLED} GOOS=linux GOARCH=${TARGETARCH} go build -a -o manager main.go
 
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 FROM registry.access.redhat.com/ubi8/ubi-minimal:latest