Add connection check in autotest.sh for pgsql docker

When using pgsql docker for testing locally with autotest, make sure to
properly wait for the port to be available.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

autotest.sh

@@ -309,8 +309,10 @@ function execute_tests {
 
 			echo "Waiting for Postgres initialisation ..."
 
-			# grep exits on the first match and then the script continues
-			docker logs -f "$DOCKER_CONTAINER_ID" 2>&1 | grep -q "database system is ready to accept connections"
+			if ! apps/files_external/tests/env/wait-for-connection $DATABASEHOST 5432 60; then
+				echo "[ERROR] Waited 60 seconds for $DATABASEHOST, no response" >&2
+				exit 1
+			fi
 
 			echo "Postgres is up."
 		else