images: arm64: initial version

Image for arm64 target.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>
Reviewed-by: Frédéric Dalleau <frederic.dalleau@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D7206

apertis-image-arm64.yaml

+{{ $architecture := or .architecture "arm64" }}
+{{ $type := "minimal" }}
+{{ $mirror := or .mirror "https://repositories.apertis.org/apertis/" }}
+{{ $suite := or .suite "17.12" }}
+{{ $timestamp := or .timestamp "00000000.0" }}
+{{ $ospack := or .ospack (printf "ospack_%s-%s-%s_%s.tar.gz" $suite $architecture $type $timestamp) }}
+{{ $image := or .image (printf "apertis-%s-%s-%s_%s.img" $suite  $type $architecture $timestamp) }}
+
+{{ $cmdline := or .cmdline " rootwait ro" }}
+
+architecture: {{ $architecture }}
+
+actions:
+  - action: unpack
+    description: Unpack {{ $ospack }}
+    compression: gz
+    file: {{ $ospack }}
+
+  - action: image-partition
+    imagename: {{ $image }}
+{{ if eq $type "minimal" }}
+    imagesize: 4294967296
+{{end}}
+    partitiontype: gpt
+
+    mountpoints:
+      - mountpoint: /
+        partition: system
+        flags: [ boot ]
+        options: ro
+      - mountpoint: /boot
+        partition: boot
+      - mountpoint: /home
+        partition: general_storage
+
+    partitions:
+      - name: boot
+        fs: ext2
+        start: 0%
+        end: 256M
+        flags: [ boot ]
+      - name: system
+        fs: btrfs
+        start: 256M
+{{ if eq $type "minimal" }}
+        end: 1024M
+{{end}}
+      - name: general_storage
+        fs: btrfs
+{{ if eq $type "minimal" }}
+        start: 1024M
+{{end}}
+        end: -4M
+
+  - action: filesystem-deploy
+    description: Deploying ospack onto image
+
+  - action: run
+    description: Add kernel parameters
+    chroot: true
+    command: sed -i '1 s/$/{{ $cmdline }}/' /etc/kernel/cmdline
+
+  - action: apt
+    description: Kernel and system packages for amd64
+    packages:
+      - kmod
+      - linux-base
+      - initramfs-tools
+      - linux-image-4.9.0-0.bpo.2-arm64-unsigned
+      - u-boot-common
+      - btrfs-tools
+
+  - action: run
+    description: Cleanup /var/lib
+    script: scripts/remove_var_lib_parts.binary
+
+  - action: run
+    description: Create block map for {{ $image }}
+    postprocess: true
+    command: bmaptool create {{ $image }} > {{ $image }}.bmap
+
+  - action: run
+    description: Compress {{ $image }}
+    postprocess: true
+    command: gzip -f {{ $image }}
+
+  - action: run
+    description: Checksum for {{ $image }}.gz
+    postprocess: true
+    command: md5sum {{ $image }}.gz > {{ $image }}.gz.md5