Add benchmark tests for CI

docker/docker_entrypoint.sh

 #! /bin/bash
 
-set -euo pipefail 
+set -euo pipefail
 
 SCRIPTDIR="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 
@@ -8,7 +8,7 @@ cleanup () {
   echo "Performing cleanup...."
   python_pid=$(pidof 'python3')
   echo "python_pid: $python_pid"
-  
+
   kill -INT $python_pid
 
   echo "Waiting for hafah finish..."
@@ -34,6 +34,13 @@ done
 
 pushd /home/hafah_user/app
 
+# credits: https://stackoverflow.com/a/39028690/11738218
+RETRIES=12
+until psql ${POSTGRES_URL} -c "SELECT 1" > /dev/null 2>&1 || [ $RETRIES -eq 0 ]; do
+  echo "Waiting for postgres server, $((RETRIES--)) remaining attempts..."
+  sleep 10
+done
+
 ./scripts/setup_postgres.sh --postgres-url=${POSTGRES_URL}
 ./scripts/setup_db.sh --postgres-url=${POSTGRES_URL}