docs: Create gitlab-continuous-integration.md

docs/docs/recipes/gitlab-continuous-integration.md

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+---
+title: "Recipes: Continuous Integration on Gitlab"
+tableOfContentsDepth: 1
+---
+
+Push your code to gitlab and automate your production build!
+
+### Prerequisites
+
+- Make sure you have the [Gatsby CLI](https://www.gatsbyjs.org/docs/gatsby-cli) installed
+- A [Gitlab](https://gitlab.com/) account 
+
+### Directions
+1. Create a gatsby site
+```shell
+gatsby new {your-project-name}
+```
+2. Change directory and start a development server
+```shell
+cd {your-project-name}
+yarn develop
+```
+
+3. Stop your development server (`Ctrl + C` on your command line in most cases)
+
+4. Create a `.gitlab-ci.yml` with the following content:
+
+```
+image: node:12.16.1
+
+cache:
+  paths:
+    - node_modules/
+
+stages:
+  - build
+
+build:
+  stage: build
+  script:
+    - yarn
+    - yarn build
+```
+
+3. `git push <you-remote-gitlab-repo>`
+4. Check out your pipeline under the CI/CD option. 
+
+### Additional resources
+
+- See how you can develop this simple file into something more real world [Gitlab CI/CD Docs](https://docs.gitlab.com/ee/ci/README.html)
+- Check this especially to learn how to make your newly build available for a next job - [Gitlab Job Artifacts Docs](https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html)
+
+- [Getting started with GitLab CI/CD](https://gitlab.com/help/ci/quick_start/README)