Merge branch 'add/gitlab-ci-yml' into 'main'

Port existing CI configuration

Closes #1

See merge request !2

files/default.yml

+include:
+  - remote: https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/templates/image.yml
+  - remote: https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/templates/variables.yml
+  - remote: https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/templates/cache.yml
+  - remote: https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/templates/stages.yml
+  - remote: https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/templates/before-script.yml
+  - remote: https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/templates/matrix.yml

files/templates/before-script.yml

+before_script:
+  - curl -o "${CI_PROJECT_DIR}/Makefile" https://git-cdn.e15r.co/gitlab/ci/golang/-/raw/main/files/Makefile
+  - mkdir -p $GOPATH/src/$(dirname $REPO_NAME)
+  - cp -R $CI_PROJECT_DIR $GOPATH/src/$REPO_NAME
+  - cd $GOPATH/src/$REPO_NAME
+  - cp config-sample.json config.json
+
+  - export CC=clang
+
+  - make dep

files/templates/cache.yml

+cache:
+  paths:
+    - /apt-cache
+    - $GOPATH/src/github.com
+    - $GOPATH/src/golang.org
+    - $GOPATH/src/google.golang.org
+    - $GOPATH/src/gopkg.in

files/templates/image.yml

+image: containers.ethitter.com:443/docker/images/golang:latest

files/templates/matrix.yml

+unit_tests:
+  stage: test
+  script:
+    - make test
+
+race_detector:
+  stage: test
+  script:
+    - make race
+
+memory_sanitizer:
+  stage: test
+  script:
+    - make msan
+
+code_coverage:
+  stage: test
+  script:
+    - make coverage
+
+code_coverage_report:
+  stage: test
+  script:
+    - make coverhtml
+  only:
+  - master
+
+lint_code:
+  stage: test
+  script:
+    - make lint
+
+build:
+  stage: build
+  script:
+    - make
+  artifacts:
+    paths:
+      - dyndnsd-client/

files/templates/stages.yml

+stages:
+  - test
+  - build

files/templates/variables.yml

+variables:
+  REPO_NAME: "${CI_SERVER_HOST}/${CI_PROJECT_NAMESPACE}/$(CI_PROJECT_NAME)"