added Makefile

Makefile

@@ -0,0 +1,39 @@
+# Setup defaults
+MAKE ?= make
+DOCKER ?= docker
+PLATFORM ?= linux/arm64/v8,linux/amd64
+BUILDER ?= container
+
+version				:= $(shell cat package.json | grep '"version": "' | sed 's/  "version": "//' | tr -d '",')
+
+# Help target borrowed from: https://docs.cloudposse.com/reference/best-practices/make-best-practices/
+## This help screen
+help:
+	@printf "Available targets:\n\n"
+	@awk '/^[a-zA-Z\-\_0-9%:\\]+/ { \
+	    helpMessage = match(lastLine, /^## (.*)/); \
+		if (helpMessage) { \
+		    helpCommand = $$1; \
+		    helpMessage = substr(lastLine, RSTART + 3, RLENGTH); \
+		    gsub("\\\\", "", helpCommand); \
+		    gsub(":+$$", "", helpCommand); \
+		    printf "  \x1b[32;01m%-35s\x1b[0m %s\n", helpCommand, helpMessage; \
+		} \
+	    } \
+	    { lastLine = $$0 }' $(MAKEFILE_LIST) | sort -u
+	@printf "\n"
+
+## Build release-ready docker images with proper tags and output push commands in stdout
+images_release_multi_load: # entrypoints
+	@echo "make sure you have buildx configured 'docker buildx ls', if not 'docker buildx create --name container --driver=docker-container'"
+	$(DOCKER) buildx build \
+		-t splitsoftware/split-evaluator:latest -t splitsoftware/split-evaluator:$(version) \
+		--platform $(PLATFORM) \
+		--builder $(BUILDER) \
+		--load .
+	@echo "Images created. Make sure everything works ok, and then run the following commands to push them."
+	@echo "$(DOCKER) push splitsoftware/split-evaluator:$(version)"
+	@echo "$(DOCKER) push splitsoftware/split-evaluator:latest"
+
+platform_str		= $(if $(PLATFORM),--platform $(PLATFORM),)
+builder_str		= $(if $(BUILDER),--builder $(BUILDER),)