Makefile: emit build for arm32 (raspberrypi)

Signed-off-by: Rohit Yadav <rohit@apache.org>
diff --git a/Makefile b/Makefile
index 174c58a..0a0beca 100644
--- a/Makefile
+++ b/Makefile
@@ -52,7 +52,7 @@
 	rm -fr dist
 	mkdir -p dist
 	GOOS=linux   GOARCH=amd64 $(GO) build -mod=vendor -ldflags='-s -w -X main.GitSHA=$(GIT_SHA) -X main.BuildDate=$(DATE)' -o dist/cmk.linux.amd64 cmk.go
-	GOOS=linux   GOARCH=arm64 $(GO) build -mod=vendor -ldflags='-s -w -X main.GitSHA=$(GIT_SHA) -X main.BuildDate=$(DATE)' -o dist/cmk.linux.arm64 cmk.go
+	GOOS=linux   GOARCH=arm $(GO) build -mod=vendor -ldflags='-s -w -X main.GitSHA=$(GIT_SHA) -X main.BuildDate=$(DATE)' -o dist/cmk.linux.arm32 cmk.go
 	GOOS=windows GOARCH=amd64 $(GO) build -mod=vendor -ldflags='-s -w -X main.GitSHA=$(GIT_SHA) -X main.BuildDate=$(DATE)' -o dist/cmk.exe cmk.go
 	GOOS=darwin  GOARCH=amd64 $(GO) build -mod=vendor -ldflags='-s -w -X main.GitSHA=$(GIT_SHA) -X main.BuildDate=$(DATE)' -o dist/cmk.darwin.amd64 cmk.go