Sort optional environment variables.

README.md

@@ -262,10 +262,10 @@ distribution's name must be of the form: `foundryvtt-0.7.9.zip`
 
 | Name  | Purpose | Default |
 |-------|---------|---------|
-| `CONTAINER_PRESERVE_OWNER` | Normally the ownership of the `/data` directory and its contents are changed to match that of the server at startup.  Setting this to a regular expression will exclude any matching paths and preserve their ownership.   _Note: This is a match on the whole path, not a search._  This is useful if you want mount a volume as read-only inside `/data` (e.g.; a volume that contains assets mounted at `/data/Data/assets`).  | |
 | `CONTAINER_PATCHES` | Set a path to a directory of shell scripts to be sourced after Foundry is installed but before it is started.  The path should be in `/data` or another persistent mount point in the container. e.g.; `/data/container_patches`  Patch files are sourced in lexicographic order.  `CONTAINER_PATCHES` are processed after `CONTAINER_PATCH_URLS`.|  |
 | `CONTAINER_PATCH_URLS` | Set to a space-delimited list of URLs to be sourced after Foundry is installed but before it is started.  Patch URLs are sourced in the order specified.  `CONTAINER_PATCH_URLS` are processed before `CONTAINER_PATCHES`.  ⚠️ **Only use patch URLs from trusted sources!** | |
 | `CONTAINER_PRESERVE_CONFIG` | Normally new `options.json` and `admin.txt` files are generated by the container at each startup.  Setting this to `true` prevents the container from modifying these files when they exist.  If they do not exist, they will be created as normal. | `false` |
+| `CONTAINER_PRESERVE_OWNER` | Normally the ownership of the `/data` directory and its contents are changed to match that of the server at startup.  Setting this to a regular expression will exclude any matching paths and preserve their ownership.   _Note: This is a match on the whole path, not a search._  This is useful if you want mount a volume as read-only inside `/data` (e.g.; a volume that contains assets mounted at `/data/Data/assets`).  | |
 | `CONTAINER_VERBOSE` | Set to `true` to enable verbose logging for the container utility scripts. | `false` |
 | `FOUNDRY_ADMIN_KEY` | Admin password to be applied at startup.  If omitted the admin password will be cleared.  May be set [using secrets](#using-secrets). | |
 | `FOUNDRY_AWS_CONFIG` | An absolute or relative path that points to the [awsConfig.json](https://foundryvtt.com/article/aws-s3/) or `true` for AWS environment variable [credentials evaluation](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-credentials-node.html) usage. | `null` |