arm64: fix development images space run out

Signed-off-by: Héctor Orón Martínez <zumbi@debian.org>

Differential Revision: https://phabricator.apertis.org/D7302

apertis-image-uboot.yaml

 {{ $architecture := or .architecture "arm64" }}
-{{ $type := "minimal" }}
+{{ $type := or .type "minimal" }}
 {{ $mirror := or .mirror "https://repositories.apertis.org/apertis/" }}
 {{ $suite := or .suite "17.12" }}
 {{ $timestamp := or .timestamp "00000000.0" }}
@@ -20,6 +20,8 @@ actions:
     imagename: {{ $image }}
 {{ if eq $type "minimal" }}
     imagesize: 4294967296
+{{ else }}
+    imagesize: 15G
 {{end}}
     partitiontype: gpt
 
@@ -51,6 +53,8 @@ actions:
         fs: btrfs
 {{ if eq $type "minimal" }}
         start: 1024M
+{{ else }}
+        start: 8672M
 {{end}}
         end: -4M