added arm64 build support

Signed-off-by: jasmingacic <jasmin.gacic@gmail.com>

.github/workflows/release.yml

@@ -48,6 +48,7 @@ jobs:
           context: server
           file: server/Dockerfile
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
@@ -73,7 +74,8 @@ jobs:
           ref: "main"
           fetch-depth: 0
           token: ${{ secrets.CI_BOT_TOKEN }}
-
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
       - name: Install Helm
         uses: azure/setup-helm@v1
         with:

server/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.17 AS build
+FROM --platform=$BUILDPLATFORM docker.io/golang:1.17 as builder
 WORKDIR /go/src
 # Copy `go.mod` for definitions and `go.sum` to invalidate the next layer
 # in case of a change in the dependencies
@@ -7,11 +7,13 @@ COPY go.mod go.sum ./
 RUN go mod download
 
 ARG TELEMETRY_TOKEN
+ARG TARGETARCH
+ARG TARGETOS
 
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -v -ldflags "-X github.com/kubeshop/kusk-gateway/pkg/analytics.TelemetryToken=$TELEMETRY_TOKEN" -o kusk-gateway-api
+RUN RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -v -ldflags "-X github.com/kubeshop/kusk-gateway/pkg/analytics.TelemetryToken=$TELEMETRY_TOKEN" -o kusk-gateway-api
 
-FROM scratch AS runtime
+FROM --platform=$BUILDPLATFORM gcr.io/distroless/static:nonroot
 COPY --from=build --chown=65532:65532 /go/src/kusk-gateway-api ./
 EXPOSE 8080/tcp