fix: force yarn in netlify via netlify.toml

- Used to guess yarn based on yarn.lock existence

Signed-off-by: Peter Lyons <pete@reactioncommerce.com>

bin/build.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# Please Use Google Shell Style: https://google.github.io/styleguide/shell.xml
+
+# ---- Start unofficial bash strict mode boilerplate
+# http://redsymbol.net/articles/unofficial-bash-strict-mode/
+set -o errexit  # always exit on error
+set -o errtrace # trap errors in functions as well
+set -o pipefail # don't ignore exit codes when piping output
+set -o posix    # more strict failures in subshells
+# set -x          # enable debugging
+
+IFS=$'\n\t'
+# ---- End unofficial bash strict mode boilerplate
+
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
+export PATH="${PWD}/node_modules/.bin:${PATH}"
+declare -a args=(
+  --ignore-scripts
+  --no-lockfile
+  --no-progress
+  --non-interactive
+  --silent
+)
+yarn "${args[@]}"
+cd package
+yarn "${args[@]}"
+yarn build

netlify.toml

@@ -0,0 +1,7 @@
+[build]
+  environment = { YARN_VERSION = "1.16.0" }
+  command = "./bin/build.sh"
+
+[dev]
+  command = "yarn styleguide:build" # Command to start your dev server
+  port = 3999

package.json

@@ -171,7 +171,8 @@
     "webpack": "~3.8.1",
     "webpack-dev-server": "~2.9.4",
     "webpack-manifest-plugin": "~1.3.2",
-    "whatwg-fetch": "~3.0.0"
+    "whatwg-fetch": "~3.0.0",
+    "yarn": "~1.16.0"
   },
   "snyk": true,
   "commitlint": {