main/postmarketos-base: install fwupd-efi if fwupd and systemd-boot available

So that firmware can be upgraded via fwupd EFI built-in methods

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7244>

main/postmarketos-base/APKBUILD

@@ -1,6 +1,6 @@
 pkgname=postmarketos-base
 pkgver=50
-pkgrel=0
+pkgrel=1
 pkgdesc="Meta package for minimal postmarketOS base"
 url="https://postmarketos.org"
 arch="noarch"
@@ -32,6 +32,7 @@ install="$pkgname.post-install $pkgname.post-upgrade"
 triggers="$pkgname.trigger=/usr/share/deviceinfo"
 subpackages="
 	$pkgname-core
+	$pkgname-fwupd
 	$pkgname-grub
 	$pkgname-mesa
 	$pkgname-nftables
@@ -153,6 +154,14 @@ core() {
 	ln -s usr/sbin "$subpkgdir"/sbin
 }
 
+fwupd() {
+	pkgdesc="fwupd configuration"
+	install_if="$pkgname=$pkgver-r$pkgrel systemd-boot fwupd"
+	depends="fwupd-efi"
+
+	mkdir -p "$subpkgdir"
+}
+
 grub() {
 	install_if="$pkgname=$pkgver-r$pkgrel grub"