test(ci): enforce fmt. of *.{md,js,html,yml} with prettier 3.3.3

This actually may enforce the format of other files than these, but it's
unlikely.

Author: ErichDonGubler

.github/workflows/ci.yml

@@ -812,6 +812,22 @@ jobs:
       - name: Check for typos
         uses: crate-ci/[email protected]
 
+  fmt-non-blocking:
+    # runtime is normally 15 seconds
+    timeout-minutes: 2
+
+    name: Format & Typos (non-blocking)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v6
+
+      - name: "Format `**/*.{md,js,html,yml}` files"
+        uses: creyD/[email protected]
+        with:
+          prettier_version: 3.3.3
+          prettier_options: --write .
+
   check-cts-runner:
     # runtime is normally 2 minutes
     timeout-minutes: 10