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"
@@ -73,7 +73,7 @@ sha512sums="
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 2faac294bb632762e247b850f09ff4b544ccff6c462efd8d4faca71ba30bdfa9c460377a0dc88e92c5dbbe251017d164064a56ac0e0410f224b45d4f5f81866c  rootfs-etc-systemd-logind.conf
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+0e30cad5ab3a84807c406b66e391bf4c420d40c763fdb768a8194a499b91a705c18233921ad62d2d201de3fe3386e970cfddf55c38b6ba42fd565322ab51fe5e  rootfs-usr-lib-systemd-system-preset-90-base.preset
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 "