build: makefile add arm arch

Author: jimyag

.gitignore

@@ -1 +1,2 @@
-pingexporter
+pingexporter
+pingexporter.toml

Makefile

@@ -1,3 +1,6 @@
 version=$(shell git describe --tags --always)
+ldflags="-s -w -X github.com/jimyag/version-go.version=$(version) -X github.com/jimyag/version-go.enableCmd=true"
 build:
-	go build -o pingexporter -v --trimpath -ldflags "-s -w -X github.com/jimyag/version-go.version=$(version) -X github.com/jimyag/version-go.enableCmd=true" ./
+	go build -o pingexporter -v --trimpath -ldflags ${ldflags} ./
+arm64:
+	CGO_ENABLED=0 GOARCH=arm64 go build -o pingexporter -v --trimpath -ldflags ${ldflags} ./