Fix hack/test-tuned-fdp.sh (#1285)

When testing new TuneD releases, we use the official Dockerfile.rhel9.
The official Containerfile uses
registry.ci.openshift.org/ocp/<OCP-VERSION>:base-rhel<RHEL-VERSION>
images.  These images use a wrapper for dnf/yum commands.  The purpose
of that wrapper to wrap yum/dnf invocations that are issued by CI
workloads or local docker builds of OCP components.

While the wrapper is useful to build an image identical or close to
identical to the actual ART releases, it will ignore any custom
repositories supplied to it via the "podman build" process and volume
mounting /etc/yum.repos.d.

The behaviour of the wrapper dnf/yum script can be modified by supplying
it ART_DNF_WRAPPER_POLICY variable.  Setting the value "append" to this
variable does exactly what we need -- do not remove base image .repo
files from dnf runs - only add ART repos based on invocation context.

Co-authored-by: Jiri Mencak <[email protected]>

Author: jmencak

hack/test-tuned-fdp.sh

@@ -61,7 +61,7 @@ EOF
 
 deploy_custom_nto() {
   # Prepare Makefile and deploy-custom-nto.sh variables
-  export IMAGE_BUILD_EXTRA_OPTS="-v=$REPO_DIR:/etc/yum.repos.d:z"
+  export IMAGE_BUILD_EXTRA_OPTS="-v=$REPO_DIR:/etc/yum.repos.d:z --env=ART_DNF_WRAPPER_POLICY=append"
   export DOCKERFILE=Dockerfile.rhel9	# Do not build TuneD from source, use pre-built TuneD RPMs.  These RPMs might contain extra patches which do not ship ustream.
   export ORG