Add Gitlab CI configuration.
With the test and deploy configutation migrated to Gitlab CI, dependency on Travis is no longer required, allowing us to move the repository to 'gitlab.freedesktop.org'.
- .gitlab-ci.yml: New file.
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With the test and deploy configutation migrated to Gitlab CI, dependency on Travis is no longer required, allowing us to move the repository to 'gitlab.freedesktop.org'.