Add SS_SILENCED_SYSTEM_CHECKS environment var

Based on https://docs.djangoproject.com/en/4.2/ref/settings/#silenced-system-checks

Author: scollazo

install/README.md

@@ -223,6 +223,12 @@ of these settings or provide values to mandatory fields.
   - **Type:** `integer`
   - **Default:** `900`
 
+- **`SS_SILENCED_SYSTEM_CHECKS`**:
+  - **Description:**  comma-separated list of ignored system checks.
+    e.g. mysql.W002,models.W042
+  - **Type:** `string`
+  - **Default:** `None`
+
 The configuration of the database is also declared via environment variables.
 Storage Service looks up the `SS_DB_URL` environment string. If defined, its
 value is expected to follow the form described in the [dj-database-url docs],

src/archivematica/storage_service/storage_service/settings/base.py

@@ -754,3 +754,5 @@ def _get_email(email):
     )
     INSTALLED_APPS = INSTALLED_APPS + ["django_prometheus"]
     LOGIN_EXEMPT_URLS.append(r"^metrics$")
+
+SILENCED_SYSTEM_CHECKS = environ.get("SS_SILENCED_SYSTEM_CHECKS", "[]")

src/archivematica/storage_service/storage_service/settings/production.py

@@ -79,6 +79,3 @@
 # Note: This key should only be used for development and testing.
 SECRET_KEY = get_env_variable("DJANGO_SECRET_KEY")
 # ######## END SECRET CONFIGURATION
-
-# Remove warning about autocreated primary keys.
-SILENCED_SYSTEM_CHECKS = ["models.W042"]