Update .gitlab-ci.yml 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
+  # instead of calling g++ directly you can also use some build toolkit like make
+  # install the necessary build tools when needed
+  before_script:
+    - apt update && apt -y install cmake
+  script:
+    - cmake .
+    - cmake --build .
+  artifacts:
+    paths:
+      - c_make
+      # depending on your build setup it's most likely a good idea to cache outputs to reduce the build time
+      # cache:
+      #   paths:
+      #     - "*.o"
+
+
+deploy:
+  stage: deploy
+  script: echo "Define your deployment script!"
+  environment: production