refactor: better "uninstall cliwrap"

build.sh

@@ -2,7 +2,19 @@
 
 set -ouex pipefail
 
-export RPMOSTREE_CLIWRAP_SKIP=1
+# there is no 'rpm-ostree cliwrap uninstall-from-root', but this is close enough. See:
+# https://github.com/coreos/rpm-ostree/blob/6d2548ddb2bfa8f4e9bafe5c6e717cf9531d8001/rust/src/cliwrap.rs#L25-L32
+if [ -d /usr/libexec/rpm-ostree/wrapped ]; then
+    # binaries which could be created if they did not exist thus may not be in wrapped dir
+    rm -f \
+        /usr/bin/yum \
+        /usr/bin/dnf \
+        /usr/bin/kernel-install
+    # binaries which were wrapped
+    mv -f /usr/libexec/rpm-ostree/* /usr/bin
+    rm -fr /usr/libexec/rpm-ostree
+fi
+
 rpm-ostree install dnf5
 
 case "${IMAGE}" in