✨(version) convey version information to the /config endpoint and footer

We add the machinery to get version information and display it discreetly.

src/backend/core/api/viewsets.py

@@ -504,7 +504,7 @@ class ConfigView(views.APIView):
         GET /api/v1.0/config/
             Return a dictionary of public settings.
         """
-        array_settings = ["LANGUAGES", "FEATURES", "RELEASE"]
+        array_settings = ["LANGUAGES", "FEATURES", "RELEASE", "COMMIT"]
         dict_settings = {}
         for setting in array_settings:
             dict_settings[setting] = getattr(settings, setting)

src/backend/core/tests/test_api_config.py

@@ -20,6 +20,7 @@ def test_api_config_anonymous():
     assert response.status_code == HTTP_200_OK
     assert response.json() == {
         "LANGUAGES": [["en-us", "English"], ["fr-fr", "French"]],
+        "COMMIT": "NA",
         "FEATURES": {
             "CONTACTS_DISPLAY": True,
             "CONTACTS_CREATE": True,
@@ -42,6 +43,7 @@ def test_api_config_authenticated():
     assert response.status_code == HTTP_200_OK
     assert response.json() == {
         "LANGUAGES": [["en-us", "English"], ["fr-fr", "French"]],
+        "COMMIT": "NA",
         "FEATURES": {
             "CONTACTS_DISPLAY": True,
             "CONTACTS_CREATE": True,