Add gitlab-ci file

.gitlab-ci.yml

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+# This file is a template, and might need editing before it works on your project.
+# You can copy and paste this template into a new `.gitlab-ci.yml` file.
+# You should not add this template to an existing `.gitlab-ci.yml` file by using the `include:` keyword.
+#
+# To contribute improvements to CI/CD templates, please follow the Development guide at:
+# https://docs.gitlab.com/ee/development/cicd/templates.html
+# This specific template is located at:
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/C++.gitlab-ci.yml
+
+# use the official gcc image, based on debian
+# can use versions as well, like gcc:5.2
+# see https://hub.docker.com/_/gcc/
+
+image: gcc
+
+build:
+  stage: build
+  before_script:
+     - apt update && apt -y install make cmake ninja-build pkg-config xorg-dev libgtk-3-dev python3 python3-mypy
+  script:
+    - make purge configure-debug install
+
+# run tests using the binary built before
+test:
+  stage: test
+  script:
+    - make test