ci(next-drupal): work-around for flakey code coverage reporting

Issue #740

.github/workflows/next-drupal.yml

@@ -14,6 +14,12 @@ jobs:
         with:
           ref: ${{github.event.pull_request.head.ref}}
           repository: ${{github.event.pull_request.head.repo.full_name}}
+      # TODO: Work-around for failing code coverage.
+      # https://github.com/chapter-three/next-drupal/issues/740
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18.19.x'
       - name: Install packages
         run: yarn
       - name: Run tests

.nvmrc

@@ -1 +1,5 @@
-v18
+v18.19
+
+# @TODO v18.20 and v20.10 and later have a bug that causes Jest code coverage to randomly fail. When the tracking bug is fixed, switch to the less-specific "v18" or "v20" version. See https://github.com/chapter-three/next-drupal/issues/740
+
+# Note: This is a non-standard .nvmrc comment. Currently, nvm ignores all lines except the 1st line so we are hijacking this implementation detail to add comments to this file. See https://github.com/nvm-sh/nvm/pull/2288#issuecomment-1115079020