Chore: Detaching go tools from the main Grafana workspace (#104861)

* add script for tooling

* add to make

* not to forget

* reworked go tools

* add tool installation script

* adding readme

* updating readme

* updating readme

* cleanup install.sh and makefile

* update the readme file

* cleanup scripts

* switch variables.mk to lazy evaluation

* add tools ache to gitignore

* get rid of absolute path in hte Variables.mk file

* switch to reusable function for path generation

* add debug statements

* add create cache tool dir

* add debuig statements to make file

* drop tool cache

* fix race condition n ci

* fix race condition n ci

* cleanup workspace

* add lefthook.rc to codeowners

* copy .citools folder to docker image

* switch back to main branch of grafana-build

* Add .citools to the drone builder

* fix wording in generate.sh and README.md

.citools/Variables.mk

@@ -0,0 +1,34 @@
+# Generated tool paths
+tools_dir := $(shell cd $(dir $(lastword $(MAKEFILE_LIST))) && pwd)
+src_dir := $(tools_dir)/src
+
+# Due to a race condition, after initial call to `go tool` golang may report a wrong binary location pointing to the invalid `/tmp/go-buildXXX` directory
+define compile_tool
+$(shell \
+  (cd $(src_dir)/$(1) \
+  && GOWORK=off go tool -n $(2) > /dev/null \
+  && GOWORK=off go tool -n $(2)) | sed 's/^[[:space:]]*//g'; \
+)
+endef
+
+
+# Tool: "bra"
+bra = "$(call compile_tool,bra,github.com/unknwon/bra)"
+
+# Tool: "cog"
+cog = "$(call compile_tool,cog,github.com/grafana/cog/cmd/cli)"
+
+# Tool: "cue"
+cue = "$(call compile_tool,cue,cuelang.org/go/cmd/cue)"
+
+# Tool: "golangci-lint"
+golangci-lint = "$(call compile_tool,golangci-lint,github.com/golangci/golangci-lint/v2/cmd/golangci-lint)"
+
+# Tool: "jb"
+jb = "$(call compile_tool,jb,github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb)"
+
+# Tool: "lefthook"
+lefthook = "$(call compile_tool,lefthook,github.com/evilmartians/lefthook)"
+
+# Tool: "swagger"
+swagger = "$(call compile_tool,swagger,github.com/go-swagger/go-swagger/cmd/swagger)"