main/shutdown-clear-rtc-wakealarm: new aport (MR 3905)

This contains an OpenRC service that clears the RTC wake alarm.
Users who don't want the RTC wake alarm to power on their phone from
powered-off state can use this service to clear the alarm during shutdown.

Fixes #1970

[ci:skip-build] already built successfully in CI

main/shutdown-clear-rtc-wakealarm/APKBUILD

+# Maintainer: Arnav Singh <me@arnavion.dev>
+pkgname=shutdown-clear-rtc-wakealarm
+pkgver=1.0.0
+pkgrel=0
+pkgdesc="Pre-shutdown service to clear RTC wake alarm"
+url="https://wiki.postmarketos.org/wiki/Shutdown-clear-rtc-wakealarm"
+arch="noarch"
+license="MIT"
+source="
+	clear-rtc-wakealarm.shutdown.initd
+	"
+install="$pkgname.post-install"
+
+package() {
+	install -Dm755 "$srcdir"/clear-rtc-wakealarm.shutdown.initd "$pkgdir"/etc/init.d/clear-rtc-wakealarm
+}
+
+sha512sums="
+5e19659b9e8d2ab182ea8658a752d08c950c526546864288c5387a3e28f7973baebcf0d49350bfced1387160f4dde963c6f921f5cd4e3730940b88ae3e443cba  clear-rtc-wakealarm.shutdown.initd
+"

main/shutdown-clear-rtc-wakealarm/clear-rtc-wakealarm.shutdown.initd

+#!/sbin/openrc-run
+
+description="Clear RTC wake alarm during shutdown"
+
+start() {
+	echo 0 >/sys/class/rtc/rtc0/wakealarm
+}

main/shutdown-clear-rtc-wakealarm/shutdown-clear-rtc-wakealarm.post-install

+#!/bin/sh
+
+# Print usage instructions
+cat << __EOF__
+*
+* To use this service, add it to the shutdown runlevel with:
+*
+*     rc-update add clear-rtc-wakealarm shutdown
+*
+__EOF__
+
+exit 0