keep going for checkstyle

Author: Zbynek Konecny

.github/workflows/quick-check.yml

@@ -6,6 +6,8 @@ on: [push, pull_request]
 jobs:
   build:
     runs-on: ubuntu-latest
+    # jobs other than 21 should not halt the whole build
+    continue-on-error: ${{ matrix.java-version != '21' }}
     strategy:
       matrix:
         java-version: ['11', '17', '21', '22']
@@ -59,7 +61,7 @@ jobs:
           done
       - name: Upload checkstyle xml for manual review
         uses: actions/upload-artifact@v4
-        if: ${{ matrix.java-version == '21' }}
+        if: ${{  always() && matrix.java-version == '21' }}
         with:
           name: checkstyle-reports-java${{ matrix.java-version }}
           path: 'gwt/build/out/**/checkstyle*.xml'