Add deadcode to Makefile

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

Makefile

@@ -73,6 +73,10 @@ etc/bash_completion.d/wwctl: wwctl
 lint: $(config)
 	$(GOLANGCI_LINT) run --build-tags "$(WW_GO_BUILD_TAGS)" --timeout=5m ./...
 
+.PHONY: deadcode
+deadcode: $(config)
+	$(GOLANG_DEADCODE) -test ./...
+
 .PHONY: vet
 vet: $(config)
 	go vet ./...
@@ -221,6 +225,7 @@ wwapird: vendor
 dist: vendor
 
 lint: $(GOLANGCI_LINT)
+deadcode: $(GOLANG_DEADCODE)
 
 protofiles = internal/pkg/api/routes/wwapiv1/routes.pb.go \
 	internal/pkg/api/routes/wwapiv1/routes.pb.gw.go \

Tools.mk

@@ -7,6 +7,8 @@ GO_TOOLS_VENDOR := $(addprefix vendor/, $(GO_TOOLS))
 GOLANGCI_LINT := $(TOOLS_BIN)/golangci-lint
 GOLANGCI_LINT_VERSION := v1.56.2
 
+GOLANG_DEADCODE := $(TOOLS_BIN)/deadcode
+
 PROTOC := $(TOOLS_BIN)/protoc
 PROTOC_GEN_GO := $(TOOLS_BIN)/protoc-gen-go
 PROTOC_GEN_GO_GRPC := $(TOOLS_BIN)/protoc-gen-go-grpc
@@ -32,6 +34,9 @@ $(GO_TOOLS_BIN):
 $(GOLANGCI_LINT):
 	curl -qq -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(TOOLS_BIN) $(GOLANGCI_LINT_VERSION)
 
+$(GOLANG_DEADCODE):
+	GOBIN="$(PWD)/$(TOOLS_BIN)" go install golang.org/x/tools/cmd/deadcode@v0.24.0
+
 $(PROTOC): $(TOOLS_DIR)
 	cd $(TOOLS_DIR) && curl -LO $(PROTOC_URL) && unzip -o $(notdir $(PROTOC_URL))
 	touch --no-create $(PROTOC) # by default the timestamp is preserved from the archive