use yarn for dev-cli

scripts/e2e-test.sh

@@ -4,7 +4,7 @@ CUSTOM_COMMAND="${2:-yarn test}"
 GATSBY_PATH="${CIRCLE_WORKING_DIRECTORY:-../../}"
 
 # cypress docker does not support sudo and does not need it, but the default node executor does
-command -v gatsby-dev || command -v sudo && sudo npm install -g gatsby-dev-cli || npm install -g gatsby-dev-cli &&
+command -v gatsby-dev || command -v sudo && sudo yarn global add gatsby-dev-cli || yarn global add gatsby-dev-cli &&
 
 # setting up child integration test link to gatsby packages
 cd "$SRC_PATH" &&