Run pipeline only via Run Pipeline button via web

.gitlab-ci.yml

@@ -6,6 +6,7 @@ build-zynthbox-image-armhf:
     - arm64
   image: ubuntu:22.04@sha256:cb6ce0db39adc371523a22a0031aa978ad3efbb13a279b7608010c82f8ab214e
   stage: build
+  # Run pipeline only via Run Pipeline button via web
   rules:
     - if: $CI_PIPELINE_SOURCE == "web"
   script: