Test reconnection to postgres in gh actions

.github/workflows/integration-test.yml

@@ -170,6 +170,26 @@ jobs:
               echo "Server has stopped"
               exit 1
           fi
+          
+          # Check that service will reconnect to postgres when connection will be closed
+          status_code=$(curl --write-out %{http_code} -s --output /dev/null http://localhost:8081/api/tags)
+          if [[ "$status_code" -ne 200 ]] ; then
+            echo "Server has failed before postgres reconnect check"
+            exit 1
+          fi
+
+          echo "Terminating all connections to postgres..."
+          python -c "import os, psycopg2 as pg2; \
+            conn = pg2.connect(dsn=os.environ['DATABASE_URL'].replace('+pool', '')); \
+            cur = conn.cursor(); \
+            cur.execute('SELECT pg_terminate_backend(psa.pid) FROM pg_stat_activity psa WHERE datname = current_database() AND pid <> pg_backend_pid();')"
+          
+          status_code=$(curl --write-out %{http_code} -s --output /dev/null http://localhost:8081/api/tags)
+          if [[ "$status_code" -ne 200 ]] ; then
+            echo "Server has not reconnected to postgres after connection was closed: returned status $status_code"
+            exit 1
+          fi
+
 
 #      - name: Test backend with MySQL
 #        if: success() || steps.sqlite.conclusion == 'failure' || steps.postgres.conclusion == 'failure'