chore: updating run binary CI scripts to support external contributors (#23021)

Author: tbiethman

circle.yml

@@ -873,7 +873,16 @@ commands:
  # Ensure we're installing the node-version for the cloned repo
  command: |
  if [[ -f .node-version ]]; then
- curl -L https://raw.githubusercontent.com/cypress-io/cypress/<< pipeline.git.branch >>/scripts/ensure-node.sh --output ci-ensure-node.sh
+ branch="<< pipeline.git.branch >>"
+
+ externalBranchPattern='^pull\/[0-9]+'
+ if [[ $branch =~ $externalBranchPattern ]]; then
+ # We are unable to curl from the external PR branch location
+ # so we fall back to develop
+ branch="develop"
+ fi
+
+ curl -L https://raw.githubusercontent.com/cypress-io/cypress/$branch/scripts/ensure-node.sh --output ci-ensure-node.sh
  else 
  # if no .node-version file exists, we no-op the node script and use the global yarn
  echo '' > ci-ensure-node.sh