ci: add missing test group

.woodpecker/docs.yml

@@ -8,16 +8,17 @@ when:
 steps:
   markdownlint:
     image: quay.io/thegeeklab/markdownlint-cli
+    group: test
     commands:
       - markdownlint 'README.md'
 
   spellcheck:
     image: quay.io/thegeeklab/alpine-tools
+    group: test
     commands:
       - spellchecker --files '_docs/**/*.md' 'README.md' -d .dictionary -p spell indefinite-article syntax-urls
     environment:
       FORCE_COLOR: "true"
-      NPM_CONFIG_LOGLEVEL: "error"
 
   link-validation:
     image: docker.io/lycheeverse/lychee