Make the APT mirror easier to customize

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

.gitlab-ci.yml

@@ -8,6 +8,7 @@ stages:
 variables:
   RELEASE: "v2021pre"
   DISTRO: apertis
+  MIRROR: https://repositories.apertis.org/apertis/
   STABLE: auto
   TEST_TAG: test-${CI_PIPELINE_ID}
 
@@ -49,7 +50,7 @@ build-base-rootfs:
   script:
     - >
       cd base &&
-      debos -t osname:${DISTRO} -t suite:${RELEASE} -t stable:$STABLE rootfs.yaml
+      debos -t osname:${DISTRO} -t suite:${RELEASE} -t stable:$STABLE  -t mirror:"$MIRROR" rootfs.yaml
 
 .build-docker-image:
   image:
@@ -141,7 +142,7 @@ test-image-builder:
     name: $CI_REGISTRY_IMAGE/${RELEASE}-image-builder:${TEST_TAG}
     entrypoint: [ "" ]
   script:
-    - debos -t osname:${DISTRO} -t suite:${RELEASE} image-builder/test-recipe.yaml
+    - debos -t osname:${DISTRO} -t suite:${RELEASE} -t mirror:"${MIRROR}" image-builder/test-recipe.yaml
 
 test-flatdeb-builder:
   stage: image test