Try fix proxy issue?

snap/snapcraft.yaml

@@ -148,6 +148,7 @@ parts:
     override-stage: |
       npm install --global yarn
       if [ -n "${http_proxy-}" ]; then
+        echo "${http_proxy}}"
         # yarn config set httpProxy "${http_proxy}"
         # yarn config set httpsProxy "${http_proxy}"
         export GLOBAL_AGENT_HTTP_PROXY="${http_proxy}"