metrics: Generate PNGs alongside the PDF report

This PR generates the PNGs for the kata metrics PDF report.

Signed-off-by: Gabriela Cervantes <gabriela.cervantes.tellez@intel.com>

tests/metrics/report/report_dockerfile/genreport.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Copyright (c) 2018-2023 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+REPORTNAME="metrics_report.pdf"
+
+cd scripts
+
+Rscript --slave -e "library(knitr);knit('pdf.Rmd')"
+Rscript --slave -e "library(knitr);pandoc('pdf.md', format='latex')"
+
+Rscript --slave -e "library(knitr);knit('html.Rmd')"
+Rscript --slave -e "library(knitr);pandoc('html.md', format='html')"
+
+cp /scripts/pdf.pdf /outputdir/${REPORTNAME}
+cp /scripts/figure/*.png /outputdir/
+echo "PNGs of graphs and tables can be found in the output directory."
+echo "The report, named ${REPORTNAME}, can be found in the output directory"