Images recipes for Raspberry Pi 64b

Added recipes for RPi 3/4 in 64b mode booted via u-boot -- both for APT and ostree images.

Added gitlab-ci to integrate images into pipeline. No tests added since we have no test boards in LAVA.

Generated images tested manually.

apertis-ospack-minimal.yaml

@@ -35,6 +35,13 @@ actions:
     chroot: true
     script: scripts/apt_source.sh -m {{ $mirror }} -r {{ $suite }} {{if eq $stable "true"}} --updates --security {{end}} target
 
+{{ if eq $architecture "arm64" }}
+  - action: run
+    description: "Add non-free apt source"
+    chroot: true
+    script: scripts/apt_source.sh -m {{ $mirror }} -r {{ $suite }} {{if eq $stable "true"}} --updates --security {{end}} non-free
+{{ end }}
+
   - action: apt
     description: "Core packages"
     packages: