gerboweb: Modularize deployment playbooks a bit

render.sh

@@ -1,20 +0,0 @@
-#!/bin/sh
-
-[ $# != 1 ] && exit 1
-ID=$1
-egrep -x -q '^[-0-9A-Za-z]{36}$'<<<"$ID" || exit 2
-
-systemd-nspawn \
-    -D /var/cache/gerbolyze_container \
-    -x --bind=/var/cache/gerboweb/upload/$ID:/mnt \
-    /bin/sh -c "set -euo pipefail
-unzip -j -d /tmp/gerber /mnt/gerber.zip
-rm -f /mnt/render_top.png /mnt/render_bottom.png /mnt/render_top.small.png /mnt/render_bottom.small.png
-date; echo 'Rendering bottom layer'
-gerbolyze render top /tmp/gerber /mnt/render_top.png
-date; echo 'Scaling down'
-convert /mnt/render_top.png -resize 500x500 -negate -brightness-contrast 30x30 -colorspace gray /mnt/render_top.small.png
-date; echo 'Rendering top layer'
-gerbolyze render bottom /tmp/gerber /mnt/render_bottom.png
-date; echo 'Scaling down'
-convert /mnt/render_bottom.png -resize 500x500 -negate -brightness-contrast 30x30 -colorspace gray /mnt/render_bottom.small.png"