Replace bash based waiting with python based django-probes.

docker/entrypoint.sh

@@ -3,6 +3,8 @@ set -eo pipefail
 
 source /venv/bin/activate
 
+# first wait for the database
+umap wait_for_database
 # then migrate the database
 umap migrate
 # then collect static files

pyproject.toml

@@ -36,6 +36,7 @@ dependencies = [
   "django-agnocomplete==2.2.0",
   "django-compressor==4.3.1",
   "django-environ==0.10.0",
+  "django-probes==1.7.0",
   "Pillow==9.5.0",
   "psycopg2==2.9.6",
   "requests==2.31.0",

umap/settings/base.py

@@ -117,6 +117,7 @@ INSTALLED_APPS = (
     'django.contrib.admin',
     'django.contrib.gis',
 
+    'django_probes',
     'umap',
     'compressor',
     'social_django',