replace celery with APScheduler

Author: kreinern

backend/analyzer/apps.py

@@ -4,3 +4,7 @@
 class AnalyzerConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'analyzer'
+
+    def ready(self):
+        from analyzer.scheduler import start_scheduler
+        start_scheduler()

backend/analyzer/scheduler.py

@@ -0,0 +1,7 @@
+from apscheduler.schedulers.background import BackgroundScheduler
+from analyzer.tasks import check_projects_for_new_cves
+
+def start_scheduler():
+    scheduler = BackgroundScheduler()
+    scheduler.add_job(check_projects_for_new_cves, 'interval', days=1, id='check_projects')
+    scheduler.start()

backend/requirements.txt

@@ -14,3 +14,4 @@ cyclonedx-python-lib==8.2.1
 whitenoise==6.7.0
 celery[redis]==5.3.0
 django-celery-beat==2.8.0
+apscheduler==3.10.1