Merge ~rbarry/grafana-snap:rock into grafana-snap:rock

[Ryan Barry]

Only set proxy options for yarn

diff --git a/snapcraft.yaml b/snapcraft.yaml
index 9361535..331fdf7 100644
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -89,12 +89,10 @@ parts:
       npm config set unsafe-perm true
       # We have to limit node's max memory usage otherwise we'll run
       # into OOM issues even with a 10GB RAM VM.
-      NODE_OPTIONS="--max-old-space-size=8192"
-      [[ -v http_proxy ]] && NODE_OPTIONS="${NODE_OPTIONS} --proxy ${http_proxy}"
-      [[ -v https_proxy ]] && NODE_OPTIONS="${NODE_OPTIONS} --https-proxy ${https_proxy}"
-      export NODE_OPTIONS=${NODE_OPTIONS}
+      export NODE_OPTIONS="--max-old-space-size=8192"
       npm install --location=global --prefix $SNAPCRAFT_PART_BUILD yarn
-      env | sort
+      [[ -v http_proxy ]] && yarn config set httpProxy ${http_proxy}
+      [[ -v https_proxy ]] && yarn config set httpxProxy ${https_proxy}
       yarn config
       YARN_ENABLE_PROGRESS_BARS=false yarn install --immutable
       yarn run build