portage/isos/savedconfig: new script to update linux-firmware pruning

This should make it easier to keep up to date with linux-firmware
updates and make sure we're installing as many important firmwares as we
can.

Signed-off-by: Ben Kohler <bkohler@gentoo.org>

releases/portage/isos/savedconfig/sys-kernel/prune_firmwares.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+# This script operates on a new vanilla linux-firmware savedconfig file to create
+# an updated pruned file for minimal livecds.  It will directly replace the 
+# linux-firwmare file in this directory.
+#
+# Some firmware types we prune include GPU firmwares, DVB firmwares, and unusually
+# large firmwares for enterprise 10G+ NICs.
+
+# Example usage:
+#   ./prune_firmwares.sh /etc/portage/savedconfig/sys-kernel/linux-firmware-20230515
+#   git add . && git commit -sS
+
+echo "# $(git config user.name) <$(git config user.email)> ($(date +%Y-%m-%d))" > linux-firmware
+echo "# Last updated for $(basename ${1})" >> linux-firmware
+
+sed 	-e's/^a300/#a300/' \
+	-e 's/^amd/#amd/' \
+	-e 's/^atusb/#atusb/' \
+	-e 's/^av7110/#av7110/' \
+	-e 's/^cadence/#cadence/' \
+	-e 's/^cavium/#cavium/' \
+	-e 's/^cmmb/#cmmb/' \
+	-e 's/^dabusb/#dabusb/' \
+	-e 's/^dsp56k/#dsp56k/' \
+	-e 's/^dvb/#dvb/' \
+	-e 's/^emi26/#emi26/' \
+	-e 's/^ene-/#ene-/' \
+	-e 's/^f2255/#f2255/' \
+	-e 's/^go7007/#go7007/' \
+	-e 's/^hfi1/#hfi1/' \
+	-e 's/^i915/#i915/' \
+	-e 's/^isdbt/#isdbt/' \
+	-e 's/^keyspan/#keyspan/' \
+	-e 's/^liquidio/#liquidio/' \
+	-e 's/^matrox/#matrox/' \
+	-e 's/^mellanox/#mellanox/' \
+	-e 's/^moxa/#moxa/' \
+	-e 's/^mts/#mts/' \
+	-e 's/^netronome/#netronome/' \
+	-e 's/^nvidia/#nvidia/' \
+	-e 's/^qat/#qat/' \
+	-e 's/^qed/#qed/' \
+	-e 's/^r128/#r128/' \
+	-e 's/r8a779x/#r8a779x/' \
+	-e 's/^radeon/#radeon/' \
+	-e 's/^s5p-mfc/#s5p-mfc/' \
+	-e 's/^sms1/#sms1/' \
+	-e 's/^sxg/#sxg/' \
+	-e 's/^tdmb/#tdmb/' \
+	-e 's/^tlg/#tlg/' \
+	-e 's/^usbdux/#usbdux/' \
+	-e 's/^v4l-/#v4l-/' \
+	${1} >> linux-firmware