Opt out of persisting credentials

`actions/checkout` uses a default value of `true` for
`persist-credentials`, which results in credentials being written to
the Git config.

Author: landongrindheim

.github/workflows/build.yml

@@ -27,6 +27,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          persist-credentials: false
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with: