Deprecate cliwrap

I'm looking at handling kernel overrides:
- coreos#4726
- https://gitlab.com/fedora/bootc/tracker/-/issues/22

And I think the cliwrap thing turned out to be the wrong approach
for this.

There's consensus now it was the wrong approach, so deprecate it.

Signed-off-by: Colin Walters <[email protected]>

docs/cliwrap.md

@@ -3,7 +3,13 @@ parent: Experimental features
 nav_order: 1
 ---
 
-# Wrapping other CLI entrypoints
+# DEPRECATED: Wrapping other CLI entrypoints
+
+**This functionality is now deprecated and slated for removal**. 
+
+The below text documents the functionality as it exists today for historical reference.
+
+---
 
 A simple way to describe the goal of rpm-ostree is to convert the default model for operating system updates to be "image based".
 

rust/src/treefile.rs

@@ -1460,6 +1460,10 @@ impl Treefile {
             deprecated = true;
             eprintln!("warning: initramfs-args is deprecated, use /etc/dracut.conf.d")
         }
+        if self.get_cliwrap() {
+            deprecated = true;
+            eprintln!("warning: cliwrap is deprecated and slated for removal");
+        }
         if deprecated {
             std::thread::sleep(std::time::Duration::from_secs(3));
         }