chore: add Makefile and formatting

Author: jremy42

Makefile

@@ -0,0 +1,60 @@
+
+# Makefile for scaleway-sdk-go
+
+WORKDIR := $(shell pwd)
+
+# Go versions to test against (matching GitHub Actions)
+GO_VERSIONS := 1.23.x 1.24.x
+
+# List all Go packages (excluding vendor and testdata)
+PKGS := $(shell go list ./... | grep -v /testdata)
+
+# Build architectures to test
+ARCHS := 386 amd64 arm arm64
+
+# Platforms to test
+PLATFORMS := windows-latest macos-latest
+
+.PHONY: all build install-dependencies format format-check lint test test-coverage doc prebuild generate-alias generate-packages generate-global-sdk-package publish format-generated clean check-tokens build-arch-test build-platform-test unit-test
+
+all: build
+
+build:
+	go build -v ./...
+
+install-dependencies:
+	go mod tidy
+	go mod download
+
+format:
+	go fmt ./...
+	./scripts/lint.sh --write
+
+format-check:
+	@echo "Checking code formatting..."
+	@if [ -n "$$(gofmt -l .)" ]; then \
+		echo "Files not formatted:"; \
+		gofmt -l .; \
+		exit 1; \
+	fi
+	@echo "Code formatting is correct"
+
+lint:
+	./scripts/lint.sh
+
+test:
+	go test -v -race -cover $(PKGS)
+
+test-coverage:
+	go test -coverprofile=coverage.out $(PKGS)
+	go tool cover -func=coverage.out
+	go tool cover -html=coverage.out -o coverage.html
+
+generate:
+	buf generate --timeout 0
+	make format
+
+
+format-generated:
+	./formatting/run.sh -i "./api"
+