Convert shell script to Go (#3413)

* Change to awk

* excluded print and -F

* xargs variation

* go-script to replace ref

* Part 1 - convert sh into go

* Go script

* del exp-openapi

* bin file in gitignore

* exclude bin file

* Revert yaml files

* code change for yaml file

* mv go-script to scripts dir

* required changes

* delete export-openapi.sh

* delete binary file main

* kubectl proxy - log, sleep time, graceful termination

* gen-embedded-openapi target for go script, run make gen-install

* agones - go mod vendor

* tmp dir path change

* fix modifyJSONFiles(), make gen-install

* revert go.mod, go.sum and vendor/modules.txt

* change path

.gitignore

@@ -38,4 +38,5 @@ build/allocation
 debug.test
 obj
 test/sdk/cpp/sdk/
+build/scripts/k8s-export-openapi/main
 

build/Makefile

@@ -725,8 +725,9 @@ push-agones-sdk-linux-image-amd64: build-agones-sdk-image-amd64
 	docker push $(sidecar_linux_amd64_tag)
 
 # Generate the Embedded CRD openapi
-gen-embedded-openapi:
-	docker run --rm $(common_mounts) -w $(workdir_path)/build $(build_tag) ./export-openapi.sh
+gen-embedded-openapi: ensure-build-image
+	docker run --rm $(common_mounts) --workdir=$(mount_path)/build/scripts/k8s-export-openapi $(DOCKER_RUN_ARGS) $(build_tag) \
+		go run -mod=mod ./main.go
 
 # Generate the static install script
 gen-install: $(ensure-build-image)

build/scripts/k8s-export-openapi/go.mod

@@ -0,0 +1,5 @@
+module github.com/agones/agones/build/scripts/k8s-export-openapi
+
+go 1.20
+
+require github.com/itchyny/json2yaml v0.1.4

build/scripts/k8s-export-openapi/go.sum

@@ -0,0 +1,2 @@
+github.com/itchyny/json2yaml v0.1.4 h1:/pErVOXGG5iTyXHi/QKR4y3uzhLjGTEmmJIy97YT+k8=
+github.com/itchyny/json2yaml v0.1.4/go.mod h1:6iudhBZdarpjLFRNj+clWLAkGft+9uCcjAZYXUH9eGI=