Address code review comment and make build configurable

Dockerfile

@@ -1,8 +1,9 @@
+ARG BUILD_SPEC="build.amd64"
 FROM golang:1.22
 
 WORKDIR /go/src/github.com/paypal/load-watcher
 COPY . .
-RUN make build
+RUN make ${BUILD_SPEC}
 
 FROM alpine:3.12
 

Makefile

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-COMMONENVVAR=GOOS=$(uname -s | tr A-Z a-z)
-GOARCHVAR=GOARCH=$(uname -m | tr A-Z a-z)
 BUILDENVVAR=CGO_ENABLED=0
 
 .PHONY: all
@@ -22,7 +20,15 @@ all: build
 
 .PHONY: build
 build:
-	$(COMMONENVVAR) $(BUILDENVVAR) $(GOARCHVAR) go build -o bin/load-watcher main.go
+	GOOS=linux $(BUILDENVVAR) GOARCH=arm64 go build -o bin/load-watcher main.go
+
+.PHONY:	build.amd64
+build.amd64:
+	GOOS=darwin $(BUILDENVVAR) GOARCH=amd64 go build -o bin/load-watcher main.go
+
+.PHONY:	build.arm64
+build.arm64:
+	GOOS=linux $(BUILDENVVAR) GOARCH=arm64 go build -o bin/load-watcher main.go
 
 .PHONY: clean
 clean:

pkg/watcher/internal/metricsprovider/datadog.go

@@ -61,7 +61,7 @@ func NewDatadogClient(opts watcher.MetricsProviderOpts) (watcher.MetricsProvider
 		return nil, fmt.Errorf("metric provider name should be %v, found %v", watcher.DatadogClientName, opts.Name)
 	}
 	tlsConfig := &http.Transport{
-		TLSClientConfig: &tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify}, // TODO(aqadeer): Figure out a secure way to let users add SSL certs
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify}, // TODO(lawwong): Figure out a secure way to let users add SSL certs
 	}
 	hostNameSuffix, _ := os.LookupEnv(datadogHostNameSuffixKey)
 	clusterName, _ := os.LookupEnv(datadogClusterName)