docs: add rhel90 filesystem support release note

docs/news/unreleased/rhel8.5-filesystem-support.md

@@ -9,12 +9,12 @@ mountpoint = "/"
 size = 2147483648
 ```
 
-The following `mountpoints` are supported:
+In addition to the root mountpoint, `/`, the following `mountpoints` and their sub-directories are supported:
 
 - `/var`
-- `/var/*`
 - `/home`
 - `/opt`
 - `/srv`
 - `/usr`
-- `/`
+- `/app`
+- `/data`

docs/news/unreleased/rhel9.0-filesystem-support.md

@@ -0,0 +1,20 @@
+# Add custom file system support for RHEL 9.0
+
+The `weldr` api has been extended to support custom file systems for RHEL 9.0.
+Filesystem `mountpoints` and minimum partition `size` can be set under blueprint customizations, as below:
+
+```toml
+[[customizations.filesystem]]
+mountpoint = "/"
+size = 2147483648
+```
+
+In addition to the root mountpoint, `/`, the following `mountpoints` and their sub-directories are supported:
+
+- `/var`
+- `/home`
+- `/opt`
+- `/srv`
+- `/usr`
+- `/app`
+- `/data`