Disable docker in docker tasks in terraform release script (#4914)

build/images/ingress-controller/build-ingress-controller.sh

@@ -67,7 +67,7 @@ echo ${docker_password} | docker login -u ${docker_username} --password-stdin qu
 curl -sL -o /usr/local/bin/gimme https://raw.githubusercontent.com/travis-ci/gimme/master/gimme
 chmod +x /usr/local/bin/gimme
 
-eval "$(gimme 1.13.1)"
+eval "$(gimme 1.13.6)"
 
 export GOPATH="/tmp/go"
 
@@ -80,6 +80,9 @@ git clone https://github.com/kubernetes/ingress-nginx
 
 cd ingress-nginx
 
+# disable docker in docker tasks
+export DIND_TASKS=0
+
 make register-qemu
 
 echo "Building NGINX image..."