fix: don't clean own pipeline images in clean_pipeline

Some pipelines fail at clean_pipeline when the job tries to clean itself.

.gitlab-ci.yml

@@ -670,6 +670,7 @@ clean_pipeline:
           --filter=reference=${registry}/*:pipeline-*
           --format "{{.ID}} {{.Repository}} {{.Tag}}" ;
       done
+      | grep -v ${CI_PIPELINE_ID}
       | sed -n -E 's/pipeline-([0-9]+)(-.*){0,1}$/& \1/p'
       | while read id repository tag pipeline_id ; do
         status=$(curl --silent -L