fix(ci): create output dir before writing ginkgo logs

The previous commit added per-root log files but forgot to create
the output directory before the first ginkgo invocation. On CI the
coverage/ dir did not exist yet, so the shell redirect to
cover-pkg.out.log failed with "No such file or directory" before
ginkgo even ran.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

scripts/run-coverage.sh

@@ -29,6 +29,7 @@ shift 3
 unit_roots="$*"
 
 fail=0
+mkdir -p "$out_dir"
 
 # Build flags shared by every ginkgo invocation.  We store them as a
 # newline-delimited list in $build_flags_list so we can iterate without