ci: use node image

.forgejo/workflows/validate.yml

@@ -5,7 +5,8 @@ on:
 
 jobs:
   prettier:
-    runs-on: k8s
+    runs-on: docker
+    container: ghcr.io/containerbase/node:20.10.0
     steps:
       - uses: actions/checkout@v4
         with:
@@ -13,7 +14,6 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version-file: '.node-version'
           cache: 'npm'
 
       - run: npm ci