added initial gitlab-ci.yml to start building our pipeline

.gitlab-ci.yml

+stages:
+    - build-dev
+
+workflow:
+    rules:
+        - if: '$CI_PIPELINE_SOURCE == "push"'
+
+image: docker:19.03.12
+
+variables:
+    # Docker Variables
+    DOCKER_TLS_CERTDIR: "/certs"
+
+services:
+    - name: docker:19.03.12-dind
+
+before_script:
+    - docker info
+    - echo "$HARBOR_PASSWORD" | docker login -u "$HARBOR_USER" --password-stdin $HARBOR_URL
+
+build dev:
+    stage: build-dev
+    script:
+        - docker build -t workspace:gitlab-test -f services/workflow/Dockerfile.dev .