Merge branch 'bugfix/16637-faster-mksquashfs' into devel (Closes: #16637)

config/chroot_apt/preferences

@@ -53,6 +53,10 @@ Package: obfs4proxy
 Pin: release o=TorProject,n=obfs4proxy
 Pin-Priority: 990
 
+Package: squashfs-tools
+Pin: release o=Debian,n=sid
+Pin-Priority: 999
+
 Package: tails-installer
 Pin: origin deb.tails.boum.org
 Pin-Priority: 999

vagrant/lib/tails_build_settings.rb

@@ -7,7 +7,7 @@ VIRTUAL_MACHINE_HOSTNAME = 'vagrant-stretch'
 
 # Approximate amount of RAM needed to run the builder's base system
 # and perform a build
-VM_MEMORY_BASE = 2*1024
+VM_MEMORY_BASE = 1.5*1024
 
 # Approximate amount of extra space needed for builds
 BUILD_SPACE_REQUIREMENT = 12*1024