make npm_install work on alpine

Author: nolanmar511

package-lock.json

@@ -6,7 +6,6 @@ RUN go get github.com/google/pprof
 
 FROM node:10-alpine
 
-ARG ADDITIONAL_PACKAGES
 
 RUN apk add --no-cache bash $ADDITIONAL_PACKAGES
 WORKDIR /root/

system-test/Dockerfile.node10-alpine

@@ -6,8 +6,16 @@ retry() {
   "${@}" || "${@}" || "${@}" || return 1
 }
 
+function wait_only() {
+  if [ -f /bin/busybox ]; then
+    timeout -t "${@}"
+  else
+    timeout "${@}"
+  fi
+}
+
 npm_install() {
-	timeout 60 npm install "${@}"
+  wait_only 60 npm install "${@}"
 }
 
 set -eox pipefail