chore: Create an issue when a daily rebuild fails

This has been [suggested by @klausenbusk][0].

[0]: #20 (comment 201743)

Fixes: #20


Signed-off-by: Wiktor Kwapisiewicz <wiktor@metacode.biz>

.gitlab-ci.yml

@@ -5,6 +5,7 @@ stages:
   - check
   - test
   - publish
+  - report
 
 check-commits:
   before_script:
@@ -78,3 +79,11 @@ crates_publish:
   stage: publish
   tags:
     - secure
+
+issue-bot:
+  stage: report
+  image: registry.gitlab.com/gitlab-org/distribution/issue-bot:latest
+  script: /issue-bot
+  rules:
+    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
+      when: on_failure