Resolve "testing building and linting pipeline for backend"

.gitlab-ci.yml

@@ -0,0 +1,55 @@
+stages:
+  - build
+  - test
+  - docker
+
+build-backend:
+  image: golang:1.21-alpine
+  stage: build
+  rules:
+    - changes:
+      - backend/**/*
+  script:
+    - cd backend
+    - go build -o htwkalender
+  artifacts:
+    paths:
+      - backend/htwkalender
+      - backend/go.sum
+      - backend/go.mod
+
+test:
+  image: golang:1.21-alpine
+  stage: test
+  rules:
+    - changes:
+      - backend/**/*
+  script:
+    - cd backend
+    - go test -v ./...
+  dependencies:
+    - build-backend
+
+build-backend-image:
+  stage: docker
+  image: docker:20.10.16
+  services:
+    - name: docker:20.10.16-dind
+      alias: docker
+  tags:
+    - image
+  variables:
+    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+    DOCKER_HOST: tcp://docker:2376
+    DOCKER_TLS_CERTDIR: "/certs"
+    DOCKER_TLS_VERIFY: 1
+    DOCKER_CERT_PATH: "/certs/client"
+  script:
+    - cd backend
+    - docker login -u $CI_DOCKER_REGISTRY_USER -p $CI_DOCKER_REGISTRY_PASSWORD $CI_DOCKER_REGISTRY
+    - docker build -t htwkalender-backend$IMAGE_TAG .
+    - docker tag htwkalender-backend$IMAGE_TAG $CI_DOCKER_REGISTRY_USER/htwkalender:backend
+    - docker push $CI_DOCKER_REGISTRY_USER/htwkalender:backend
+  only:
+    - main
+    - development