Update CI settings to partially use new storage settings

.ci/ansible/settings.py.j2

@@ -27,19 +27,30 @@ API_ROOT = {{ api_root | repr }}
 {% endif %}
 
 {% if s3_test | default(false) %}
-DEFAULT_FILE_STORAGE = "storages.backends.s3boto3.S3Boto3Storage"
-MEDIA_ROOT = ""
-AWS_ACCESS_KEY_ID = "{{ minio_access_key }}"
-AWS_SECRET_ACCESS_KEY = "{{ minio_secret_key }}"
-AWS_S3_REGION_NAME = "eu-central-1"
-AWS_S3_ADDRESSING_STYLE = "path"
+MEDIA_ROOT: ""
 S3_USE_SIGV4 = True
-AWS_S3_SIGNATURE_VERSION = "s3v4"
-AWS_STORAGE_BUCKET_NAME = "pulp3"
-AWS_S3_ENDPOINT_URL = "http://minio:9000"
-AWS_DEFAULT_ACL = "@none None"
+STORAGES = {
+    "default": {
+        "BACKEND": "storages.backends.s3boto3.S3Boto3Storage",
+        "OPTIONS": {
+            "access_key": "{{ minio_access_key }}",
+            "secret_key": "{{ minio_secret_key }}",
+            "region_name": "eu-central-1",
+            "addressing_style": "path",
+            "signature_version": "s3v4",
+            "bucket_name": "pulp3",
+            "endpoint_url": "http://minio:9000",
+            "default_acl": "@none None",
+        },
+    },
+    "staticfiles": {
+      "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage",
+    },
+}
 {% endif %}
 
+# This is using DEFAULT_FILE_STORAGE to test both usages.
+# Remove when DEFAULT_FILE_STORAGE is completely removed.
 {% if azure_test | default(false) %}
 DEFAULT_FILE_STORAGE = "storages.backends.azure_storage.AzureStorage"
 MEDIA_ROOT = ""