tools: use new tool directive introduced in go 1.24

Dockerfile

@@ -49,10 +49,9 @@ RUN --mount=type=bind,target=.,rw \
     make bin/protoc-gen-gogoswarm && mv bin/protoc-gen-gogoswarm /usr/local/bin/
 
 FROM gobase AS protobuild
-RUN --mount=type=bind,source=tools,target=. \
-    --mount=target=/go/pkg/mod,type=cache \
+RUN --mount=type=bind,target=. \
     --mount=type=cache,target=/root/.cache \
-    go install -mod=mod github.com/containerd/protobuild
+    go install tool github.com/containerd/protobuild
 
 FROM gobase AS generate-base
 ARG DEBIAN_FRONTEND
@@ -126,7 +125,7 @@ ENV GO111MODULE=on
 # install the dependencies from `make setup`
 # we only copy `direct.mk` to avoid busting the cache too easily
 COPY direct.mk .
-COPY tools ./tools
+COPY go.* .
 RUN make --file=direct.mk setup
 # now we can copy the rest
 COPY . .

direct.mk

@@ -43,7 +43,7 @@ setup: ## install dependencies
 	@echo "🐳 $@"
 	# install golangci-lint to ./bin/golangci-lint
 	@curl -fsSL https://raw.githubusercontent.com/golangci/golangci-lint/v2.1.5/install.sh | sh -s v2.1.5
-	@(cd ./tools ; GO111MODULE=on go install github.com/containerd/protobuild)
+	@go install tool github.com/containerd/protobuild
 
 .PHONY: generate
 generate: protos

go.mod

@@ -53,6 +53,7 @@ require (
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/containerd/protobuild v0.3.0 // indirect
 	github.com/coreos/go-semver v0.3.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
@@ -68,6 +69,7 @@ require (
 	github.com/klauspost/compress v1.17.9 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/pelletier/go-toml v1.8.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_golang v1.20.5 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
@@ -91,3 +93,5 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.90.1 // indirect
 )
+
+tool github.com/containerd/protobuild