TUN-8072: Need to set GOCACHE in mac go installation script

Author: chungthuang

.teamcity/mac/install-cloudflare-go.sh

@@ -1,4 +1,8 @@
 cd /tmp/
+rm -rf go
+rm -rf gocache
+export GOCACHE=/tmp/gocache
+
 git clone -q https://github.com/cloudflare/go
 cd go/src
 # https://github.com/cloudflare/go/tree/34129e47042e214121b6bbff0ded4712debed18e is version go1.21.5-devel-cf