Add postgres env to es tests

Author: rmn-boiko

.github/workflows/build.yaml

@@ -244,6 +244,8 @@ jobs:
       - name: Elasticsearch tests
         if: matrix.elasticsearch
         env:
+          SQLX_OFFLINE: false
+          DATABASE_URL: postgres://root:root@127.0.0.1:5432/kamu-test
           ELASTICSEARCH_URL: http://127.0.0.1:9200
         run: |
           # Show actual disk headroom ES sees