Add custom Raspberry Pi minimal image

Build Raspberry Pi image using a minimal ospack including extra tools
for development purposes, docker engine and docker-compose.

Based on apertis-image-recipes [0] ospack-minimal.yaml original recipe.

[0] https://gitlab.apertis.org/infrastructure/apertis-image-recipes/



Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>