Merge app_registry and backups apps

apps/app_registry/forms.py

@@ -0,0 +1,20 @@
+from __future__ import absolute_import
+
+from django import forms
+
+from common.widgets import ScrollableCheckboxSelectMultiple
+
+from .classes import AppBackup
+from .models import App, BackupJob
+
+
+def valid_app_choices():
+    # Return app that exist in the app registry and that have been registered for backup
+    return App.live.filter(pk__in=[appbackup.app.pk for appbackup in AppBackup.get_all()])
+
+
+class BackupJobForm(forms.ModelForm):
+    apps = forms.ModelMultipleChoiceField(queryset=valid_app_choices(), widget=ScrollableCheckboxSelectMultiple())
+
+    class Meta:
+        model = BackupJob