fix: serve collected static files with whitenoise

docker/scripts/start-web.sh

@@ -9,6 +9,8 @@ case "${DJANGO_SETTINGS_MODULE}" in
     ;;
 esac
 
+python src/manage.py collectstatic --noinput
+
 exec gunicorn core.wsgi:application \
   --bind "0.0.0.0:${PORT:-8000}" \
   --workers "${GUNICORN_WORKERS:-3}" \

src/settings/base.py

@@ -227,6 +227,7 @@ USE_TZ = True
 STATIC_URL = "/static/"
 STATIC_ROOT = PROJECT_ROOT / "staticfiles"
 STATICFILES_DIRS = [BASE_DIR / "static"]
+STATICFILES_STORAGE = "whitenoise.storage.CompressedManifestStaticFilesStorage"
 
 MEDIA_URL = "/media/"
 MEDIA_ROOT = PROJECT_ROOT / "media"

tests/test_runtime_static.py

@@ -0,0 +1,31 @@
+"""Regression checks for production static-file delivery."""
+
+from pathlib import Path
+
+from django.core.management import call_command
+from django.test import Client, override_settings
+from settings import base
+
+
+def test_whitenoise_uses_compressed_manifest_storage():
+    assert (
+        base.STATICFILES_STORAGE
+        == "whitenoise.storage.CompressedManifestStaticFilesStorage"
+    )
+
+
+def test_web_startup_collects_static_files_before_gunicorn():
+    script_path = Path(__file__).parents[1] / "docker" / "scripts" / "start-web.sh"
+    script = script_path.read_text(encoding="utf-8")
+
+    assert "python src/manage.py collectstatic --noinput" in script
+    assert script.index("collectstatic --noinput") < script.index("exec gunicorn")
+
+
+def test_whitenoise_serves_collected_swagger_asset(tmp_path):
+    with override_settings(STATIC_ROOT=tmp_path):
+        call_command("collectstatic", interactive=False, verbosity=0)
+        response = Client().get("/static/drf-yasg/style.css")
+
+    assert response.status_code == 200
+    assert response["Content-Type"].startswith("text/css")