systemd/postmarketos-base-systemd: depend on systemd-services

Add the dependency, so the systemd-services package gets built as part
of the bootstrap. Otherwise no service files will be installed, as the
individual service files get pulled in via install_if, and that only
works if a binary package is available.

systemd/postmarketos-base-systemd/APKBUILD

@@ -2,7 +2,7 @@
 # pmbootstrap installs this, if systemd is selected in "pmbootstrap init".
 pkgname=postmarketos-base-systemd
 pkgver=1
-pkgrel=0
+pkgrel=1
 pkgdesc="Meta package for running postmarketOS with systemd"
 url="https://postmarketos.org"
 arch="noarch"
@@ -14,6 +14,7 @@ depends="
 	systemd
 	tzdata
 	linux-pam=1.5.3-r8
+	systemd-services
 	"
 replaces="alpine-baselayout postmarketos-base systemd"