Multi-platform kubestr image (#316)

* multi-platform kubestr image

* Adjusting Dockerfile to do a native compile + emulated image build

* remove explicit TARGETPLATFORM

.github/workflows/docker-publish.yml

@@ -61,6 +61,7 @@ jobs:
       - name: Build and push Docker image
         uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6.9.0
         with:
+          platforms: linux/amd64,linux/arm64,linux/ppc64le
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}

Dockerfile

@@ -1,10 +1,15 @@
-FROM golang:1.22-bullseye AS builder
+ARG BUILDPLATFROM
+
+FROM --platform=$BUILDPLATFORM golang:1.22-bookworm AS builder
+
+ARG TARGETOS
+ARG TARGETARCH
+ARG TARGETPLATFROM
 
 ENV GO111MODULE=on \
     CGO_ENABLED=0 \
-    GOOS=linux \
-    GOARCH=amd64 \
-    GOBIN=/dist
+    GOOS=${TARGETOS} \
+    GOARCH=${TARGETARCH} 
 
 WORKDIR /app
 
@@ -15,7 +20,7 @@ RUN go mod download
 
 COPY . .
 
-RUN go install -ldflags="-w -s" .
+RUN go build -o /dist/kubestr -ldflags="-w -s" .
 
 FROM alpine:3.19