fixup! Adding simplified diagram to README.md

Dockerfile

@@ -1,5 +1,7 @@
 # Build the manager binary
-FROM golang:1.23.5 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.23.5 AS builder
+
+ARG TARGETARCH
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -11,7 +13,7 @@ COPY cmd/observability-operator/main.go cmd/observability-operator/main.go
 COPY pkg/ pkg/
 
 # Build
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o manager cmd/observability-operator/main.go
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=$TARGETARCH GO111MODULE=on go build -a -o manager cmd/observability-operator/main.go
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details