added docs and container (podman + docker) setup

Makefile.container

@@ -0,0 +1,54 @@
+.PHONY: help build run docker-build docker-run docker-push clean
+
+BINARY_NAME=argparse-builder
+DOCKER_IMAGE=argparse-builder
+DOCKER_TAG=latest
+PORT=8080
+
+help:
+	@echo "Available targets:"
+	@echo "  build          - Build Go binary"
+	@echo "  run            - Run locally"
+	@echo "  docker-build   - Build Docker image"
+	@echo "  docker-run     - Run Docker container"
+	@echo "  docker-push    - Push to registry"
+	@echo "  docker-clean   - Remove Docker images"
+	@echo "  clean          - Clean all artifacts"
+
+build:
+	go build -ldflags="-s -w" -o $(BINARY_NAME) .
+
+run: build
+	./$(BINARY_NAME)
+
+docker-build:
+	docker build -t $(DOCKER_IMAGE):$(DOCKER_TAG) .
+
+docker-build-alpine:
+	docker build -f Dockerfile.alpine -t $(DOCKER_IMAGE):alpine .
+
+docker-run:
+	docker run -d -p $(PORT):8080 --name $(BINARY_NAME) $(DOCKER_IMAGE):$(DOCKER_TAG)
+
+docker-stop:
+	docker stop $(BINARY_NAME) && docker rm $(BINARY_NAME)
+
+docker-logs:
+	docker logs -f $(BINARY_NAME)
+
+docker-push:
+	docker push $(DOCKER_IMAGE):$(DOCKER_TAG)
+
+docker-clean:
+	docker rmi $(DOCKER_IMAGE):$(DOCKER_TAG) || true
+
+compose-up:
+	docker-compose up -d
+
+compose-down:
+	docker-compose down
+
+clean:
+	rm -f $(BINARY_NAME)
+	docker-compose down || true
+	docker rm -f $(BINARY_NAME) || true