Refactoring and cleanup (#14)

* refactoring to support multiple ips and add more documentation

* fix #12

* adds more tests

* adds a makefile to help testing on macbooks

Author: ncode

Makefile

@@ -0,0 +1,18 @@
+# Extract the Go version directly from go.mod (e.g., "1.23")
+GO_VERSION = $(shell awk '/^toolchain / {sub(/go/,"",$$2) ; print $$2}' go.mod)
+
+DOCKER_IMAGE = cni-outbound-test
+
+.PHONY: test
+test:
+	# Build the Docker image, passing GO_VERSION to the Docker build
+	docker build \
+		--build-arg GO_VERSION=$(GO_VERSION) \
+		-f Dockerfile.test \
+		-t $(DOCKER_IMAGE) .
+	# Run the container, which by default executes "go test -v ./..."
+	docker run --rm $(DOCKER_IMAGE)
+
+.PHONY: clean
+clean:
+	docker rmi $(DOCKER_IMAGE) || true