Update changelog

Author: frcroth

unreleased_changes/8912.md

@@ -0,0 +1,17 @@
+### Added
+- Datasets can be uploaded to S3-compatible object storage services. This is disabled by default.
+
+### Migration
+- New keys have been added to the application.conf of the data store.
+
+Add these lines in the "datastore" section:
+```
+s3Upload {
+    enabled = true
+    # Use the prefix / name of a credential in the dataVaults section here to use it for uploads.
+    credentialName = "s3://fsn1.your-objectstorage.com/webknossos-test/upload-tests/"
+    endpoint = "https://fsn1.your-objectstorage.com"
+    bucketName = "webknossos-test"
+    objectKeyPrefix = "upload-tests"
+  }
+```