Create ci.md

docs/ci.md

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+Its very common to compile your dist files into a docker image while running your pipelines, therefore those are examples for unglue usage inside of CI system.
+
+## GitLab
+
+```yaml
+  image: php:7.4-cli
+  stage: build
+  services:
+    - name: unglue/server
+      alias: unglue
+  before_script:
+    - apt-get install wget
+    - wget -O unglue.phar https://github.com/unglue-workflow/client/raw/master/unglue.phar
+    - chmod +x unglue.phar
+  script:
+    - ./unglue.phar compile --server=unglue:3000
+```
+
+Maybe its required to publish your artifacts for further steps, therefore use something like thise, while `resources` is the folder the compiled files are published:
+
+```yaml
+artifacts:
+  paths:
+    - "resources"
+```