Add stack slug to /organization endpoint response (#3644)

# What this PR does
Add stack slug to /organization endpoint response

## Which issue(s) this PR fixes
https://github.com/grafana/oncall-private/issues/2444
## Checklist

- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Do not retry `firebase.messaging.UnregisteredError` exceptions for FCM relay tasks by @joeyorlando ([#3637](https://github.com/grafana/oncall/pull/3637))
 - Decrease outgoing webhook timeouts from 10secs to 4secs by @joeyorlando ([#3639](https://github.com/grafana/oncall/pull/3639))
+- Add stack slug to `/organization` endpoint response by @Ferril ([#3644](https://github.com/grafana/oncall/pull/3644))
 - Moved Mobile Connection Tab to separate user profile in Grafana ([#3296](https://github.com/grafana/oncall/pull/3296)
 
 ### Fixed

engine/apps/api/serializers/organization.py

@@ -31,11 +31,13 @@ class OrganizationSerializer(EagerLoadingMixin, serializers.ModelSerializer):
         fields = [
             "pk",
             "name",
+            "stack_slug",
             "slack_team_identity",
             "slack_channel",
             "rbac_enabled",
         ]
         read_only_fields = [
+            "stack_slug",
             "slack_team_identity",
             "rbac_enabled",
         ]

engine/apps/api/tests/test_organization.py

@@ -8,6 +8,48 @@ from rest_framework.response import Response
 from rest_framework.test import APIClient
 
 from apps.api.permissions import LegacyAccessControlRole
+from apps.api.serializers.organization import CurrentOrganizationSerializer
+
+mock_banner = {"title": None, "body": None}
+mock_env_status = {
+    "telegram_configured": False,
+    "phone_provider": {
+        "configured": False,
+        "test_sms": False,
+        "test_call": False,
+        "verification_call": False,
+        "verification_sms": False,
+    },
+}
+
+
+@patch.object(CurrentOrganizationSerializer, "get_banner", return_value=mock_banner)
+@patch.object(CurrentOrganizationSerializer, "get_env_status", return_value=mock_env_status)
+@pytest.mark.django_db
+def test_get_organization(
+    mocked_banner,
+    mocked_env_status,
+    make_organization_and_user_with_plugin_token,
+    make_user_auth_headers,
+):
+    organization, user, token = make_organization_and_user_with_plugin_token()
+
+    client = APIClient()
+    url = reverse("api-internal:api-organization")
+    expected_result = {
+        "pk": organization.public_primary_key,
+        "name": organization.org_title,
+        "stack_slug": organization.stack_slug,
+        "slack_team_identity": None,
+        "slack_channel": None,
+        "rbac_enabled": organization.is_rbac_permissions_enabled,
+        "is_resolution_note_required": False,
+        "env_status": mock_env_status,
+        "banner": mock_banner,
+    }
+    response = client.get(url, format="json", **make_user_auth_headers(user, token))
+    assert response.status_code == status.HTTP_200_OK
+    assert response.json() == expected_result
 
 
 @pytest.mark.django_db