Add ci config

.gitlab-ci.yml

+---
+include:
+  - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/recipes/debian.yml
+  - https://www.opencode.net/zynthbox/gitlab-ci-tools/raw/main/zynthbox-default-ci.yml
+
+variables:
+  # Package version can only contain numbers (0-9), and dots (.).
+  # Must be in the format of X.Y.Z, i.e. should match /\A\d+\.\d+\.\d+\z/ regular expresion.
+  # See https://docs.gitlab.com/ee/user/packages/generic_packages/#publish-a-package-file
+  ARCH: 'armhf'