support build arm64 docker image

Author: kongfang

.github/workflows/publish.yml

@@ -38,6 +38,7 @@ jobs:
       uses: docker/build-push-action@v4
       with:
         context: .
+        platforms: linux/amd64,linux/arm64
         build-args: |
           KOMPANION_VERSION=${{ steps.get_tag.outputs.TAG }}
         push: true

Dockerfile

@@ -14,9 +14,11 @@ WORKDIR /app
 ARG KOMPANION_VERSION=local
 ENV KOMPANION_VERSION=$KOMPANION_VERSION
 
-RUN GOOS=linux GOARCH=amd64 \
+ARG TARGETARCH
+RUN GOOS=linux GOARCH=${TARGETARCH:-amd64} \
     go build -ldflags "-X main.Version=$KOMPANION_VERSION" -tags migrate -o /bin/app ./cmd/app
 
+
 # Step 3: Final
 FROM golang:1.22.5-alpine
 ENV GIN_MODE=release