Add patch-upstream GitHub Actions Workflow

.github/workflows/patch-upstream.yml

+name: Patch Upstream
+
+on:
+  workflow_dispatch: {}
+  schedule:
+    - cron: '0 10 * * *'
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: upstream-patched
+          fetch-depth: 0
+      - run: bash -x scripts/merge-upstream.sh

scripts/merge-upstream.sh

+#!/usr/bin/env bash
+
+set -euo pipefail -x
+
+git fetch 'https://github.com/frangio/openzeppelin-contracts.git'
+git config user.name 'github-actions'
+git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
+git merge --no-edit FETCH_HEAD
+git push

test/setup.js

+// a different comment!
 const { deployRelayHub } = require('@openzeppelin/gsn-helpers');
 
 before('deploy GSN RelayHub', async function () {