Extend image building timeout to two hours

Generating license BOM sometimes takes longer than an hour resulting in
jobs being killed.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

.gitlab-ci/image-pipeline-base.yml

@@ -6,6 +6,7 @@
     RECIPES_PATH: /tmp/recipes
     RECIPES_REPO_URL: https://gitlab-ci-token:${CI_JOB_TOKEN}@${CI_SERVER_HOST}/infrastructure/${OSNAME}-image-recipes.git
   stage: build
+  timeout: 2h
   rules:
   - when: on_success
   before_script: