Add support for arm64.

Author: shishir-a412ed

Makefile.arm64

@@ -0,0 +1,23 @@
+BINARY ?= containerd-driver
+ifndef $(GOLANG)
+    GOLANG=$(shell which go)
+    export GOLANG
+endif
+
+export GOARCH=arm64
+export GO111MODULE=on
+export GOOS=linux
+
+default: build
+
+.PHONY: clean
+clean:
+	rm -f $(BINARY)
+
+.PHONY: build
+build:
+	$(GOLANG) build -o $(BINARY) .
+
+.PHONY: test
+test:
+	./tests/run_tests.sh