Add goreleaser initial setup

.gitlab-ci.yml

 stages:
   - build
+  - release
 
 variables:
   IMAGE_PATH: "${CI_REGISTRY_IMAGE}"
 
 .build: &build
-    stage: build
-    image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:latest
-    services:
-      - name: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:latest
-        alias: docker
-    variables:
-        TAG: $CI_COMMIT_SHA
-        DOCKER_TLS_CERTDIR: "/certs"
-    before_script:
-      - apk add git
-      - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-      - docker login -u $CI_DEPENDENCY_PROXY_USER -p $CI_DEPENDENCY_PROXY_PASSWORD $CI_DEPENDENCY_PROXY_SERVER
-      - docker context create multi-arch-build
-      - docker buildx create multi-arch-build --name mybuilder --bootstrap --use
-    needs: []
+  stage: build
+  image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:latest
+  services:
+    - name: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:latest
+      alias: docker
+  variables:
+    TAG: $CI_COMMIT_SHA
+    DOCKER_TLS_CERTDIR: "/certs"
+  before_script:
+    - apk add git
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker login -u $CI_DEPENDENCY_PROXY_USER -p $CI_DEPENDENCY_PROXY_PASSWORD $CI_DEPENDENCY_PROXY_SERVER
+    - docker context create multi-arch-build
+    - docker buildx create multi-arch-build --name mybuilder --bootstrap --use
+  needs: []
 
 build-gnmi-target-ubuntu:
-    script:
-        - TAG=${CI_COMMIT_BRANCH//\//-}
-        - IMAGE_NAME="$IMAGE_PATH/ubuntu"
-        - docker buildx build --provenance=false -t "$IMAGE_NAME:$TAG" -f examples/example01/target.Dockerfile --platform linux/amd64,linux/arm64 --target "ubuntu" --push --build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/" .
-    <<: *build
+  script:
+    - TAG=${CI_COMMIT_BRANCH//\//-}
+    - IMAGE_NAME="$IMAGE_PATH/ubuntu"
+    - docker buildx build --provenance=false -t "$IMAGE_NAME:$TAG" -f examples/example01/target.Dockerfile --platform linux/amd64,linux/arm64 --target "ubuntu" --push --build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/" .
+  <<: *build
 
 build-gnmi-target-debian:
-    script:
-        - TAG=${CI_COMMIT_BRANCH//\//-}
-        - IMAGE_NAME="$IMAGE_PATH/debian"
-        - docker buildx build --provenance=false -t "$IMAGE_NAME:$TAG" -f examples/example01/target.Dockerfile --platform linux/amd64,linux/arm64 --target "debian" --push --build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/" .
-    <<: *build
+  script:
+    - TAG=${CI_COMMIT_BRANCH//\//-}
+    - IMAGE_NAME="$IMAGE_PATH/debian"
+    - docker buildx build --provenance=false -t "$IMAGE_NAME:$TAG" -f examples/example01/target.Dockerfile --platform linux/amd64,linux/arm64 --target "debian" --push --build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/" .
+  <<: *build
+
+release:
+  stage: release
+  image: docker:stable
+  services:
+    - docker:dind
+
+  variables:
+    # Optionally use GitLab's built-in image registry.
+    DOCKER_REGISTRY: $CI_REGISTRY
+    DOCKER_USERNAME: $CI_REGISTRY_USER
+    DOCKER_PASSWORD: $CI_REGISTRY_PASSWORD
+
+    # Disable shallow cloning so that goreleaser can diff between tags to
+    # generate a changelog.
+    GIT_DEPTH: 0
+
+  # Only run this release job for tags, not every commit (for example).
+  only:
+    refs:
+      - tags
+
+  script: |
+    # GITLAB_TOKEN is needed to create GitLab releases.
+    # CI_JOB_TOKEN is needed if use_job_token is set.
+    # DOCKER_* are needed to push Docker images.
+    docker run --rm --privileged \
+      -v $PWD:/go/src/gitlab.com/YourGitLabUser/YourGitLabRepo \
+      -w /go/src/gitlab.com/YourGitLabUser/YourGitLabRepo \
+      -v /var/run/docker.sock:/var/run/docker.sock \
+      -e DOCKER_USERNAME \
+      -e DOCKER_PASSWORD \
+      -e DOCKER_REGISTRY \
+      -e GITLAB_TOKEN \
+      -e CI_JOB_TOKEN \
+      goreleaser/goreleaser release --clean

.goreleaser.yml

+project_name: gnmi-target
+
+# .goreleaser.yml
+gitlab_urls:
+  api: https://code.fbi.h-da.de/api/v4/
+  download: https://code.fbi.h-da.de
+
+  # set to true if you use a self-signed certificate
+  skip_tls_verify: false
+
+  # set to true if you want to upload to the Package Registry rather than attachments
+  # Only works with GitLab 13.5+
+  #
+  # Since: v1.3
+  use_package_registry: true
+
+  # Set this if you set GITLAB_TOKEN to the value of CI_JOB_TOKEN.
+  #
+  # Since: v1.11
+  use_job_token: true
+
+builds:
+  - env: [CGO_ENABLED=0]
+    goos:
+      - linux
+    goarch:
+      - amd64
+      - arm64
+    dir: .
+    main: ./examples/example01
+
+dockers:
+  - dockerfile: "examples/example01/target.Dockerfile"
+  - image_templates:
+      - "registry.code.fbi.h-da.de/danet/gnmi-target/ubuntu:{{ .Tag }}"
+    use: buildx
+    build_flag_templates:
+      - "--provenance=false"
+      - "--platform linux/amd64,linux/arm64"
+      - '--target "ubuntu"'
+      - "--push"
+      - '--build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/"'
+
+  - image_templates:
+      - "registry.code.fbi.h-da.de/danet/gnmi-target/ubuntu:latest"
+    use: buildx
+    build_flag_templates:
+      - "--provenance=false"
+      - "--platform linux/amd64,linux/arm64"
+      - '--target "ubuntu"'
+      - "--push"
+      - '--build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/"'
+
+  - image_templates:
+      - "registry.code.fbi.h-da.de/danet/gnmi-target/debian:{{ .Tag }}"
+    use: buildx
+    build_flag_templates:
+      - "--provenance=false"
+      - "--platform linux/amd64,linux/arm64"
+      - '--target "debian"'
+      - "--push"
+      - '--build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/"'
+
+  - image_templates:
+      - "registry.code.fbi.h-da.de/danet/gnmi-target/debian:latest"
+    use: buildx
+    build_flag_templates:
+      - "--provenance=false"
+      - "--platform linux/amd64,linux/arm64"
+      - '--target "debian"'
+      - "--push"
+      - '--build-arg "GITLAB_PROXY=${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/"'