docs: add changes for v0.40.1

docs/reference/stacker_file.md

@@ -61,6 +61,8 @@ Hub.
 `built`: `tag` is required, everything else is ignored. `built` bases this
 layer on a previously specified layer in the stacker file.
 
+`scratch`: which is an empty rootfs and can be used to host statically built binaries.
+
 ### `import`
 
 The `import` directive describes what files should be made available in
@@ -110,6 +112,17 @@ import:
   - /path/to/file
 ```
 
+#### `import dest`
+
+The `import` directive also supports specifying the destination path (specified
+by `dest`) in the resulting container image, where the source file (specified
+by `path`) will be copyied to, for example:
+```
+import:
+  - path: config.json
+    dest: /
+```
+
 ### `overlay_dirs`
 This directive works only with OverlayFS backend storage.
 

docs/whats-new.md

@@ -1 +1,20 @@
 # What's New
+
+## [v0.40.1](https://github.com/project-stacker/stacker/releases/tag/v0.40.1)
+
+* Support for `scratch`
+
+Prior to v0.40.1, `stacker` did not support empty root filesystems to be used a
+base container image. The support has now been added which can be used to host
+statically built binaries.
+
+* Support for `import`ing content into container image
+
+Prior to v0.40.1, copying content into a layer permanently involved bind
+mounting a shell such as busybox and invoking appropriate commands using the
+`run` directive. Now `import` directive allows for the `dest` option to achieve
+the same.
+
+* Some `squashfs` improvements
+
+While build squashfs layers, use `squashfuse_ll` if available which is faster.