fix for absent baseline target

Author: qrort

.github/workflows/slo.yml

@@ -193,8 +193,8 @@ jobs:
               --build-arg REF="${{ steps.baseline.outputs.ref }}" \
               -f tests/slo/Dockerfile .
           else
-            echo "No baseline app Dockerfile found"
-            exit 1
+            echo "No baseline app Dockerfile found, using current image as baseline"
+            docker tag ydb-app-current ydb-app-baseline
           fi
 
       - name: Initialize YDB SLO