Revert "Changed from dphys-swapfile to zram-tools"

This reverts commit 26913016b9.

builder/data/etc/dphys-swapfile

@@ -0,0 +1,26 @@
+# /etc/dphys-swapfile - user settings for dphys-swapfile package
+# author Neil Franklin, last modification 2010.05.05
+# copyright ETH Zuerich Physics Departement
+#   use under either modified/non-advertising BSD or GPL license
+
+# this file is sourced with . so full normal sh syntax applies
+
+# the default settings are added as commented out CONF_*=* lines
+
+
+# where we want the swapfile to be, this is the default
+#CONF_SWAPFILE=/var/swap
+
+# set size to absolute value, leaving empty (default) then uses computed value
+#   you most likely don't want this, unless you have an special disk situation
+CONF_SWAPSIZE=2048
+
+# set size to computed value, this times RAM size, dynamically adapts,
+#   guarantees that there is enough swap without wasting disk space on excess
+#CONF_SWAPFACTOR=2
+
+# restrict size (computed and absolute!) to maximally this limit
+#   can be set to empty for no limit, but beware of filled partitions!
+#   this is/was a (outdated?) 32bit kernel limit (in MBytes), do not overrun it
+#   but is also sensible on 64bit to prevent filling /var or even / partition
+#CONF_MAXSWAP=2048

builder/raspberrypi64.yml

@@ -77,6 +77,7 @@
           - build-essential
           - curl
           - dkms
+          - dphys-swapfile
           - fbi
           - firmware-atheros
           - firmware-brcm80211