Proper build, supporting multi-arch

Dockerfile

@@ -1,11 +1,32 @@
-FROM alpine
+FROM --platform=$BUILDPLATFORM golang as builder
 
-RUN apk add --no-cache ca-certificates
+ARG TARGETOS
+ARG TARGETARCH
+ARG VERSION
+ARG BUILD_DATE
 
-COPY prometheus-docker-labels-discovery /prometheus-docker-labels-discovery
+COPY . /src
+
+WORKDIR /src
+
+RUN env GOOS=${TARGETOS} GOARCH=${TARGETARCH} CGO_ENABLED=0 go mod download && \
+  export GIT_COMMIT=$(git rev-parse HEAD) && \
+  export GIT_DIRTY=$(test -n "`git status --porcelain`" && echo "+CHANGES" || true) && \
+  env GOOS=${TARGETOS} GOARCH=${TARGETARCH} CGO_ENABLED=0 \
+    go build -o prometheus-docker-labels-discovery \
+    -ldflags "-X github.com/sqooba/go-common/version.GitCommit=${GIT_COMMIT}${GIT_DIRTY} \
+              -X github.com/sqooba/go-common/version.BuildDate=${BUILD_DATE} \
+              -X github.com/sqooba/go-common/version.Version=${VERSION}" \
+    .
+
+FROM --platform=$BUILDPLATFORM gcr.io/distroless/base
+
+COPY --from=builder /src/prometheus-docker-labels-discovery /prometheus-docker-labels-discovery
 
 # Because of access to docker.sock, it's easier to run it as root...
 #USER nobody
 
 ENTRYPOINT ["/prometheus-docker-labels-discovery"]
 EXPOSE 8080
+
+#HEALTHCHECK --interval=60s --timeout=10s --retries=1 --start-period=30s CMD ["/prometheus-docker-labels-discovery", "--health-check"]

Makefile

@@ -1,11 +1,13 @@
 
-VERSION=v1.0.1
+VERSION=v1.0.2
 GOOS=linux
 GOCMD=go
 GOBUILD=$(GOCMD) build
 GOCLEAN=$(GOCMD) clean
 GOTEST=$(GOCMD) test
 GOLINT=golangci-lint run
+BUILD_PLATFORM=linux/amd64
+PACKAGE_PLATFORM=$(BUILD_PLATFORM),linux/arm64,linux/arm/v7
 VERSION_MAJOR=$(shell echo $(VERSION) | cut -f1 -d.)
 VERSION_MINOR=$(shell echo $(VERSION) | cut -f2 -d.)
 BINARY_NAME=prometheus-docker-labels-discovery
@@ -27,21 +29,32 @@ lint:
 build:
 	GOOS=${GOOS} $(GOBUILD) \
 		-ldflags "-X version.GitCommit=${GIT_COMMIT}${GIT_DIRTY} \
-				  -X version.BuildDate=${BUILD_DATE} \
-				  -X version.Version=${VERSION}" \
+				  -X github.com/sqooba/go-common/version.BuildDate=${BUILD_DATE} \
+				  -X github.com/sqooba/go-common/version.Version=${VERSION}" \
 		-o ${BINARY_NAME} .
 
+
 package:
-	docker build -f Dockerfile \
-	  -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION) \
-	  -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR) \
-	  -t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR) \
-	  .
+	docker buildx build -f Dockerfile \
+		--platform $(BUILD_PLATFORM) \
+		--build-arg VERSION=$(VERSION) \
+		--build-arg BUILD_DATE=$(BUILD_DATE) \
+		-t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION) \
+		-t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR) \
+		-t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR) \
+		--load --no-cache \
+		.
 
 test:
 	go test ./...
 
 release:
-	docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION)
-	docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR)
-	docker push ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR)
+	docker buildx build -f Dockerfile \
+		--platform $(PACKAGE_PLATFORM) \
+		--build-arg VERSION=$(VERSION) \
+		--build-arg BUILD_DATE=$(BUILD_DATE) \
+		-t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION) \
+		-t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR).$(VERSION_MINOR) \
+		-t ${DOCKER_REGISTRY}${GO_PACKAGE}:$(VERSION_MAJOR) \
+		--push \
+		.

prom_file_handler.go

@@ -15,7 +15,7 @@ type promHandler struct {
 func newPromFileHandler(config envConfig) (*promHandler, error) {
 
 	if !strings.HasSuffix(config.PrometheusConfigFilePath, ".json") {
-		return nil, fmt.Errorf("file dose not have .json extension")
+		return nil, fmt.Errorf("file does not have .json extension")
 	}
 
 	err := syscall.Access(config.PrometheusConfigFilePath, syscall.O_RDWR)