Use go tools and reduce main go.mod (#4181)

* Move tools to its own directory

* Adjust scripts to go tools

* Enable workspace and clean go.mod

* Update devguide to add tools section

Author: rikatz

.gitignore

@@ -50,7 +50,6 @@ Session.vim
 /www/test_out
 .*.timestamp
 /site
-go.work
 go.work.sum
 
 /cache

go.mod

@@ -3,92 +3,72 @@ module sigs.k8s.io/gateway-api
 go 1.24.0
 
 require (
-	github.com/elastic/crd-ref-docs v0.2.0
 	github.com/miekg/dns v1.1.68
 	github.com/stretchr/testify v1.11.1
 	golang.org/x/net v0.44.0
 	golang.org/x/sync v0.17.0
-	golang.org/x/tools v0.36.0
 	google.golang.org/grpc v1.75.1
-	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1
 	google.golang.org/protobuf v1.36.8
 	k8s.io/api v0.34.1
 	k8s.io/apiextensions-apiserver v0.34.1
 	k8s.io/apimachinery v0.34.1
 	k8s.io/client-go v0.34.1
-	k8s.io/code-generator v0.34.1
 	k8s.io/kube-openapi v0.0.0-20250814151709-d7b6acb124c3
 	k8s.io/utils v0.0.0-20250820121507-0af2bda4dd1d
 	sigs.k8s.io/controller-runtime v0.22.3
-	sigs.k8s.io/controller-tools v0.19.0
 	sigs.k8s.io/structured-merge-diff/v6 v6.3.0
 	sigs.k8s.io/yaml v1.6.0
 )
 
 require (
-	github.com/Masterminds/goutils v1.1.1 // indirect
-	github.com/Masterminds/semver v1.5.0 // indirect
-	github.com/Masterminds/sprig v2.22.0+incompatible // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/emicklei/go-restful/v3 v3.13.0 // indirect
 	github.com/evanphx/json-patch/v5 v5.9.11 // indirect
-	github.com/fatih/color v1.18.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/zapr v1.3.0 // indirect
 	github.com/go-openapi/jsonpointer v0.21.2 // indirect
 	github.com/go-openapi/jsonreference v0.21.0 // indirect
 	github.com/go-openapi/swag v0.23.1 // indirect
-	github.com/gobuffalo/flect v1.0.3 // indirect
-	github.com/goccy/go-yaml v1.18.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/google/gnostic-models v0.7.0 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 // indirect
-	github.com/huandu/xstrings v1.3.3 // indirect
-	github.com/imdario/mergo v0.3.11 // indirect
-	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/mailru/easyjson v0.9.0 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mitchellh/copystructure v1.2.0 // indirect
-	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/moby/spdystream v0.5.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f // indirect
+	github.com/onsi/ginkgo/v2 v2.25.1 // indirect
+	github.com/onsi/gomega v1.38.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_golang v1.23.0 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.65.0 // indirect
 	github.com/prometheus/procfs v0.17.0 // indirect
-	github.com/spf13/cobra v1.9.1 // indirect
 	github.com/spf13/pflag v1.0.7 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/crypto v0.42.0 // indirect
 	golang.org/x/mod v0.27.0 // indirect
 	golang.org/x/oauth2 v0.30.0 // indirect
 	golang.org/x/sys v0.36.0 // indirect
 	golang.org/x/term v0.35.0 // indirect
 	golang.org/x/text v0.29.0 // indirect
 	golang.org/x/time v0.12.0 // indirect
-	golang.org/x/tools/go/expect v0.1.1-deprecated // indirect
+	golang.org/x/tools v0.36.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250826171959-ef028d996bc1 // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/gengo/v2 v2.0.0-20250820003526-c297c0c1eb9d // indirect
 	k8s.io/klog/v2 v2.130.1 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
 	sigs.k8s.io/randfill v1.0.0 // indirect