Add django-probes for wait_for_database (aboutcode-org#401)

This feature is nice-to-have for Kubernetes/OpenShift deployments making
start up of app more streamlined by giving ability for app to wait for
database to be up rather than crash until db is up.

As per it's docs it supports all db engines that Django supports:
https://pypi.org/project/django-probes/
License: BSD-3-Clause

Signed-off-by: Alexander Mazuruk <a.mazuruk@samsung.com>

Co-authored-by: tdruez <489057+tdruez@users.noreply.github.com>

Author: aalexanderr

scancodeio/settings.py

@@ -92,6 +92,7 @@
     "rest_framework",
     "rest_framework.authtoken",
     "django_rq",
+    "django_probes",
 )
 
 MIDDLEWARE = (

setup.cfg

@@ -59,6 +59,8 @@ install_requires =
     # Database
     psycopg2==2.9.3; sys_platform == "linux"
     psycopg2-binary==2.9.3; sys_platform != "linux"
+    # wait_for_database Django management command
+    django_probes==1.6.0
     # Task queue
     rq==1.10.1
     django-rq==2.5.1