Add utility script to pad a pdf with margins

app/utils/add_margin.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+if [[ -z $(which pdf-crop-margins) ]]; then
+	pip3 install -q pdfCropMargins;
+fi;
+if [[ -z $(which units) ]]; then
+	sudo apt install units
+fi;
+
+infile=$(realpath $1) 
+outfile=$(realpath $2)
+margin=${$3:-'6 mm'}
+margin=$(units -t "$margin" "inch")
+
+margin=$(echo $margin*72| bc)
+echo "Margin: " $margin
+rand_str=$(echo $RANDOM | md5sum | head -c 8)
+tmpfile="/tmp/${rand_str}.pdf"
+pdf-crop-margins -o $tmpfile -p 100 -a4 -$margin -$margin -$margin -$margin $infile
+pdfjam --outfile $outfile --paper a4paper $tmpfile