main/postmarketos-ui-os-installer: allow passwordless root during installation

This can be useful for manually installing additional packages, running
programs that require root, debugging issues, and to the best of my
knowledge poses no real security issue as it's just during installation.

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6784
[ci:skip-build]: already built successfully in CI

main/postmarketos-ui-os-installer/APKBUILD

@@ -1,7 +1,7 @@
 # Reference: https://postmarketos.org/uipkg
 # Maintainer: Clayton Craft <clayton@craftyguy.net>
 pkgname=postmarketos-ui-os-installer
-pkgver=1
+pkgver=2
 pkgrel=0
 pkgdesc="UI for installing postmarketOS"
 url="https://gitlab.gnome.org/p3732/os-installer"
@@ -93,7 +93,7 @@ package() {
 		"$pkgdir"/etc/os-installer/scripts/prepare.sh
 }
 sha512sums="
-da5f5408cc58c9202989dfd5730499abe5977ef0ca7fd017dde657f1e1d84ebffb011a171778e0b74e28424ac39796aa97085ca8d9340446eb8e6def2b7e4c17  rootfs-etc-doas.d-os-installer.conf
+7f0c1ad22753524f022696e14243bca776d0d3e5a2ea9652eb448bac1c3be8e04d6418fdcca9ebe8d6e3123c36b2bb7937ac0d1a42c9f0d6bd8512c8ef8c8e5d  rootfs-etc-doas.d-os-installer.conf
 ebbff3d4c55d631e5c75c7de77852ea77cf0bae67349536ae7714616dbe2baf7762dd71578779670fc97d286ab8b26834e2b857bb843da421a5a4e81d96b3c37  rootfs-etc-xdg-autostart-org.postmarketOS.os-installer.desktop
 e51733f5c75649206ec99b96486fc33419541dd8ff6fe2ccd9eb8cba0920a004c6190362342ecd943c99f6d6e7c5e41e1992dbe4f3f42180dfab08fa06436911  rootfs-etc-gdm-custom.conf
 5d43fcfbbcda66497067eb665537b2e38e77f335ba58989e6a24af35f10e07cf1d10ba47cd7536de87bcf60fdb5c8582c7a84b7ffaa0c47c964b0b7ae6c95cae  rootfs-usr-lib-sysusers.d-os-installer.conf

main/postmarketos-ui-os-installer/rootfs-etc-doas.d-os-installer.conf

@@ -1 +1 @@
-permit nopass keepenv :installer as root cmd /usr/bin/os-installer
+permit nopass keepenv :installer