Added job to build the docker image

.gitlab-ci.yml

@@ -0,0 +1,36 @@
+# This file is a template, and might need editing before it works on your project.
+# 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/Docker.gitlab-ci.yml
+
+# Build a Docker image with CI/CD and push to the GitLab registry.
+# Docker-in-Docker documentation: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html
+#
+# This template uses one generic job with conditional builds
+# for the default branch and all other (MR) branches.
+
+docker-build:
+  image: docker:latest
+  stage: build
+  services:
+    - docker:dind
+  variables:
+    DOCKER_IMAGE_NAME: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+    # Define the platforms
+    PLATFORMS: linux/amd64,linux/arm64/v8
+  before_script:
+    - apk add --no-cache docker-cli-buildx
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    - docker buildx create --use
+  script:
+    - |
+      docker buildx build --pull --platform $PLATFORMS -t "$DOCKER_IMAGE_NAME" . --push
+    - |
+      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
+        docker buildx build --platform $PLATFORMS -t "$CI_REGISTRY_IMAGE:latest" . --push
+      fi
+  rules:
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile