Update makefile

Makefile

@@ -1,10 +1,83 @@
 EXEC=entity-maker
+BUILD_DIR=./build
+CMD_DIR=./cmd/entity-maker
+
+# Build variables
+GOOS ?= linux
+GOARCH ?= amd64
+LDFLAGS=-s -w
 
 
 .PHONY: build
 build:
-	@go build -ldflags "-s -w" -o ./build/${EXEC} ./cmd/entity-maker/main.go
+	@echo "Building ${EXEC} for ${GOOS}/${GOARCH}..."
+	@mkdir -p ${BUILD_DIR}
+	@CGO_ENABLED=0 GOOS=${GOOS} GOARCH=${GOARCH} go build \
+		-ldflags "${LDFLAGS}" \
+		-trimpath \
+		-o ${BUILD_DIR}/${EXEC} \
+		${CMD_DIR}
+	@echo "✓ Binary created: ${BUILD_DIR}/${EXEC}"
+	@ls -lh ${BUILD_DIR}/${EXEC}
 
 
+.PHONY: build-dev
+build-dev:
+	@echo "Building ${EXEC} (development mode)..."
+	@mkdir -p ${BUILD_DIR}
+	@go build -o ${BUILD_DIR}/${EXEC} ${CMD_DIR}
+	@echo "✓ Binary created: ${BUILD_DIR}/${EXEC}"
+
+
+.PHONY: install
+install: build
+	@echo "Installing ${EXEC} to /usr/local/bin..."
+	@sudo cp ${BUILD_DIR}/${EXEC} /usr/local/bin/${EXEC}
+	@echo "✓ Installed successfully"
+
+
+.PHONY: clean
+clean:
+	@echo "Cleaning build artifacts..."
+	@rm -rf ${BUILD_DIR}
+	@rm -f ${EXEC}
+	@echo "✓ Clean complete"
+
+
+.PHONY: test
+test:
+	@echo "Running tests..."
+	@go test -v ./...
+
+
+.PHONY: verify-static
+verify-static: build
+	@echo "Verifying binary is statically linked..."
+	@file ${BUILD_DIR}/${EXEC}
+	@ldd ${BUILD_DIR}/${EXEC} 2>&1 || echo "✓ Binary is statically linked"
+
+
+.PHONY: upgrade-packages
 upgrade-packages:
+	@echo "Upgrading Go packages..."
 	@go get -u ./...
+	@go mod tidy
+	@echo "✓ Packages upgraded"
+
+
+.PHONY: help
+help:
+	@echo "Entity Maker - Makefile targets:"
+	@echo ""
+	@echo "  build              Build static binary for Linux (default)"
+	@echo "  build-dev          Build development binary with debug symbols"
+	@echo "  install            Install binary to /usr/local/bin"
+	@echo "  clean              Remove build artifacts"
+	@echo "  test               Run tests"
+	@echo "  verify-static      Verify binary has no dynamic dependencies"
+	@echo "  upgrade-packages   Update Go dependencies"
+	@echo "  help               Show this help message"
+	@echo ""
+	@echo "Build options:"
+	@echo "  GOOS=linux GOARCH=amd64 make build    (default)"
+	@echo ""