Add pipeline job to check if CRD docs have changed

.gitlab-ci.yml

@@ -73,6 +73,22 @@ test-docs-links:
     - build-docs
   script: bundle exec htmlproofer --assume-extension --allow_hash_href --url-ignore "/favicon.ico" ./_site
 
+test-docs-crds-regression:
+  stage: test
+  image: golang
+  before_script:
+    - cd docs
+    - go install fybrik.io/crdoc@latest
+  script:
+    - crdoc --resources ../theodolite/crd/ --template api-reference/crds.tmpl  --output api-reference/crds.ref.md
+    - cmp api-reference/crds.md api-reference/crds.ref.md
+  rules:
+    - changes:
+      - docs/api-reference/crds.tmpl
+      - theodolite/crd/**/*
+    - when: manual
+      allow_failure: true
+
 
 # Theodolite Helm Chart