Merge branch 'fix-makefile-version-string' into 'main'

makefile: properly escape '$' in VERSION_STRING

See merge request gitlab-org/gitlab-shell!525

Makefile

 .PHONY: validate verify verify_ruby verify_golang test test_ruby test_golang coverage coverage_golang setup _script_install build compile check clean install
 
 GO_SOURCES := $(shell find . -name '*.go')
-VERSION_STRING := $(shell git describe --match v* 2>/dev/null || awk '$0="v"$0' VERSION 2>/dev/null || echo unknown)
+VERSION_STRING := $(shell git describe --match v* 2>/dev/null || awk '$$0="v"$$0' VERSION 2>/dev/null || echo unknown)
 BUILD_TIME := $(shell date -u +%Y%m%d.%H%M%S)
 BUILD_TAGS := tracer_static tracer_static_jaeger continuous_profiler_stackdriver
 GOBUILD_FLAGS := -ldflags "-X main.Version=$(VERSION_STRING) -X main.BuildTime=$(BUILD_TIME)" -tags "$(BUILD_TAGS)"