fix: correct YAML syntax in Dremio CI workflow

Use multi-line run command with pipe operator (|) instead of
inline command with || operator to avoid YAML parsing errors.
The || operator was causing 'mapping values are not allowed here'
syntax errors in the YAML parser.

.github/workflows/s3-tables-tests.yml

@@ -213,7 +213,8 @@ jobs:
         uses: docker/setup-buildx-action@v4
 
       - name: Pre-pull Dremio image
-        run: docker pull dremio/dremio:latest || echo "Warning: Failed to pre-pull Dremio image, will try at runtime"
+        run: |
+          docker pull dremio/dremio:latest || echo 'Warning: Failed to pre-pull Dremio image, will try at runtime'
         continue-on-error: true
 
       - name: Run go mod tidy