tests/installed: Add NOTE when re-using RPMs

One gotcha here is that we don't invalidate the RPMs if we're not
sitting on the same commit anymore. Shouldn't be too hard to fix, though
let's at least make a note of it for now.

Closes: #1668
Approved by: cgwalters

tests/installed/playbook-run.sh

@@ -7,6 +7,10 @@ dn=$(cd $(dirname $0) && pwd)
 if ! test -d build; then
     mkdir -p build
     (cd build && ${dn}/../../ci/build-rpm.sh)
+else
+    # XXX: we should invalidate based on `git describe` or something
+    echo "NOTE: Re-using prebuilt RPMs:"
+    find build -name '*.rpm'
 fi
 
 # https://fedoraproject.org/wiki/CI/Tests