Add a GitLab CI/CD file.

.gitlab-ci.yml

+# Stages ----------------------------------------------------------------------
+stages:
+    - build
+
+# Before Script ---------------------------------------------------------------
+before_script:
+    - export DATE=$(date +"%Y-%m-%d")
+
+# Variables -------------------------------------------------------------------
+variables:
+    COMMIT_HASH: $CI_COMMIT_SHORT_SHA
+    PROJ_NAME: 'TreeMaker-cmssw-$CI_COMMIT_REF_NAME-${REPO_NAME}'
+
+# Job templates ---------------------------------------------------------------
+.job_template:
+    stage: build
+    variables:
+        NO_CACHE: "true"
+        CONTEXT_DIR: "${REPO_NAME}/"
+        REPO_NAME: standalone
+        IMAGE_NAME: cmssw
+	TO: "${CI_REGISTRY_IMAGE}/${IMAGE_NAME}:${CMSSW_VERSION}-${DATE}-${COMMIT_HASH}"
+    tags:
+        - docker-privileged-xl
+    image:
+        name: gitlab-registry.cern.ch/ci-tools/docker-image-builder
+        entrypoint: [""]
+    script:
+        # Build and push the image from the Dockerfile at the root of the project.
+        # To push to a specific docker tag, amend the --destination parameter, e.g. --destination $CI_REGISTRY_IMAGE:$CI_BUILD_REF_NAME
+        # See https://docs.gitlab.com/ee/ci/variables/predefined_variables.html#variables-reference for available variables
+        - echo "Building standalone image $BASE_IMAGE with $CMSSW_VERSION and $SCRAM_ARCH"
+        - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
+        - echo $CI_PROJECT_DIR/$CONTEXT_DIR/
+        - ls -lh $CI_PROJECT_DIR/$CONTEXT_DIR/
+        - /kaniko/executor --context $CI_PROJECT_DIR/$CONTEXT_DIR --dockerfile $CI_PROJECT_DIR/$CONTEXT_DIR/Dockerfile --destination $TO --build-arg=BUILD_DATE="$DATE" --build-arg=VERSION="$DATE" --build-arg=VCS_URL="$CI_REPOSITORY_URL" --build-arg=VCS_REF="$COMMIT_HASH" --build-arg BASEIMAGE="$BASE_IMAGE" --build-arg SCRAM_ARCH="$SCRAM_ARCH" --build-arg CMSSW_VERSION="$CMSSW_VERSION"
+    only:
+        variables:
+            - $STANDALONE == "True" && $CMSSW_VERSION && $SCRAM_ARCH && $BASE_IMAGE
+
+# Jobs/Includes ---------------------------------------------------------------
+include:
+    - local: '/standalone/.gitlab-ci.yml'

standalone/.gitlab-ci.yml

+build_TreeMaker_cmssw_standalone_CMSSW_10_2_21:
+    extends: .job_template
+    variables:
+        CMSSW_VERSION: CMSSW_10_2_21
+        SCRAM_ARCH: slc7_amd64_gcc700
+        BASE_IMAGE: clelange/cc7-cms:latest