Update pipeline to add url labels

.gitignore

@@ -1,5 +1,8 @@
 # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 
+site-config.json
+!site-config.json.example
+
 # dependencies
 /node_modules
 /.pnp

.gitlab-ci.yml

@@ -10,7 +10,13 @@ stages:
   script:
     - echo "Building Docker-image..."
 
-    - docker build -t $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG -t $CI_REGISTRY_IMAGE:latest .
+    - >
+      docker build 
+      --label "org.opencontainers.image.url=$CI_PROJECT_URL" 
+      --label "org.opencontainers.image.source=$CI_PROJECT_URL"
+      -t $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG 
+      -t $CI_REGISTRY_IMAGE:latest .
+    
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
     - docker push $CI_REGISTRY_IMAGE:latest