Make it easy to build with debugging support

This is a bit scrappy, (especially related to the mismatched make
targets when building the debug binaries), but the idea is to make
debugging ec more accessible.

Makefile

@@ -44,12 +44,18 @@ help: ## Display this help
 generate: ## Code-generate files
 	go generate ./...
 
+# Set DEBUG_BUILD=1 to build a binary with gdb/dlv debugging support
+BUILD_GC_FLAGS=$(if $(DEBUG_BUILD),-gcflags="-N -l",)
+BUILD_TRIMPATH=$(if $(DEBUG_BUILD),,-trimpath)
+BUILD_LD_FLAGS=$(if $(DEBUG_BUILD),,-s -w)
+BUILD_BIN_SUFFIX=$(if $(DEBUG_BUILD),_debug,)
+
 .PHONY: $(ALL_SUPPORTED_OS_ARCH)
 $(ALL_SUPPORTED_OS_ARCH): generate ## Build binaries for specific platform/architecture, e.g. make dist/ec_linux_amd64
 	@GOOS=$(word 2,$(subst _, ,$(notdir $@))); \
 	GOARCH=$(word 3,$(subst _, ,$(notdir $@))); \
-	GOOS=$${GOOS} GOARCH=$${GOARCH} CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X github.com/enterprise-contract/ec-cli/internal/version.Version=$(VERSION)" -o dist/ec_$${GOOS}_$${GOARCH}; \
-	sha256sum -b dist/ec_$${GOOS}_$${GOARCH} > dist/ec_$${GOOS}_$${GOARCH}.sha256
+	GOOS=$${GOOS} GOARCH=$${GOARCH} CGO_ENABLED=0 go build $(BUILD_TRIMPATH) $(BUILD_GC_FLAGS) -ldflags="$(BUILD_LD_FLAGS) -X github.com/enterprise-contract/ec-cli/internal/version.Version=$(VERSION)" -o dist/ec_$${GOOS}_$${GOARCH}$(BUILD_BIN_SUFFIX); \
+	sha256sum -b dist/ec_$${GOOS}_$${GOARCH}$(BUILD_BIN_SUFFIX) > dist/ec_$${GOOS}_$${GOARCH}$(BUILD_BIN_SUFFIX).sha256
 
 .PHONY: dist
 dist: $(ALL_SUPPORTED_OS_ARCH) ## Build binaries for all supported operating systems and architectures
@@ -73,12 +79,15 @@ BUILD_LOCAL_PLATFORM:=$(shell go env GOOS)/$(shell go env GOARCH)
 BUILD_LOCAL_ARCH:=$(shell go env GOOS)_$(shell go env GOARCH)
 .PHONY: build
 build: dist/ec_$(BUILD_LOCAL_ARCH) ## Build the ec binary for the current platform
-	@ln -sf ec_$(BUILD_LOCAL_ARCH) dist/ec
+	@ln -sf ec_$(BUILD_LOCAL_ARCH)$(BUILD_BIN_SUFFIX) dist/ec$(BUILD_BIN_SUFFIX)
 
 BUILD_IMG_ARCH:=$(shell podman version -f {{.Server.OsArch}} | awk -F/ '{print $$1}')_$(shell podman version -f {{.Server.OsArch}} | awk -F/ '{print $$2}')
 .PHONY: build-for-test
 build-for-test: dist/ec_$(BUILD_IMG_ARCH)
 
+debug-run:
+	dlv exec dist/ec_$(BUILD_LOCAL_ARCH)_debug # ...params here as required
+
 .PHONY: clean
 clean: ## Delete build output
 	@rm -f dist/*