GH Actions: ensure all steps have a name

Author: jrfnl

.github/workflows/ci.yml

@@ -41,7 +41,8 @@ jobs:
 
       # Show violations inline in the file diff.
       # @link https://github.com/marketplace/actions/xmllint-problem-matcher
-      - uses: korelstar/xmllint-problem-matcher@v1
+      - name: Enable showing XML issues inline
+        uses: korelstar/xmllint-problem-matcher@v1
 
       # Validate the composer.json file.
       # @link https://getcomposer.org/doc/03-cli.md#validate