configure zram swap on systemd installs

extra-repos/systemd/postmarketos-base-systemd/APKBUILD

@@ -2,7 +2,7 @@
 # Co-maintainer: Clayton Craft <clayton@craftyguy.net>
 # pmbootstrap installs this, if systemd is selected in "pmbootstrap init".
 pkgname=postmarketos-base-systemd
-pkgver=26
+pkgver=27
 pkgrel=0
 pkgdesc="Meta package for running postmarketOS with systemd"
 url="https://postmarketos.org"
@@ -30,6 +30,7 @@ depends="
 	systemd-services
 	systemd-timesyncd
 	tzdata
+	zram-generator
 	"
 replaces="alpine-baselayout postmarketos-base systemd systemd-logind"
 replaces_priority=100
@@ -41,6 +42,7 @@ _source644="
 	usr/share/mkinitfs/files-extra/01-initramfs-base-systemd.files
 	usr/lib/systemd/system-preset/90-base.preset
 	usr/lib/systemd/user-preset/90-base.preset
+	usr/lib/systemd/zram-generator.conf
 "
 
 _source755="
@@ -75,5 +77,6 @@ fbaa33425e507062a454f11bda48508f261c2144e5c23a20f567dc1cef14ce1dec57f8d934f418f5
 15423bfda57c90ab62fe69865ca4072a0aeb83bf77d9c278257e346f4da81843d010b41003c91ae9f3fcb1c67447645e7c19078eea2bf11312051e6ad7523ad1  rootfs-usr-share-mkinitfs-files-extra-01-initramfs-base-systemd.files
 fb69154ca6f55e49992f38c9c1b34dba6f08fcbf36dcb85e21519879c58b47c833babbc1c55e160a414c347d4f546cec477565368995fbab6632a23156637df4  rootfs-usr-lib-systemd-system-preset-90-base.preset
 c7ec5a4e7c7dcbf855f34e80adb225f52221340099216e57792b04f07e7b367e004209551e9a74152d9212926aba1b1a0a2680d3c2e35f15cca6f3cf0c9a3841  rootfs-usr-lib-systemd-user-preset-90-base.preset
+4e6fc1b09f9509f28d2777d38744ab613f4505019fa011a7568438c7657dce4e98eede18ced892153e4d7aea8f66e09f9c16d224d14a1c6de1bdec128027fe97  rootfs-usr-lib-systemd-zram-generator.conf
 605df1f004783d2e0ec5dd99a688bca27502c8c24bc05fb4dc26589b2070b0fbd1cf9bd56e6861d7cda2f8ac8147e7eb040acfd886185c01c8cf9de8b1ce2dcd  rootfs-usr-bin-setup-timezone
 "