tests: add restorecon checks for /usr, /etc and /boot

tmt/tests/booted/readonly/025-test-restorecon.nu

@@ -0,0 +1,23 @@
+use std assert
+use tap.nu
+
+# Test each directory separately for better granularity
+let directories = ["/boot", "/etc", "/usr"]
+
+for dir in $directories {
+    tap begin $"Run restorecon on ($dir)"
+
+    # Run restorecon on single directory and capture trimmed output
+    let out = (restorecon -vnr $dir | str trim)
+
+    if $dir == "/boot" {
+        # /boot is expected to have incorrect labels - known issue
+        # See: https://github.com/bootc-dev/bootc/issues/1622
+        print $"Note: /boot restorecon output \(expected\): ($out)"
+    } else {
+        # Assert it's empty for other directories
+        assert equal $out "" $"restorecon run found incorrect labels in ($dir): ($out)"
+    }
+
+    tap ok
+}