[gimp-web/oscp] Make manual trigger conditional

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit f9e8064f07c3260947f058c7707a3c90c5b2b351
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Mon May 30 13:03:51 2022 +0200

    Make manual trigger conditional

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4ed5c0db..91c5d81f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,8 @@
     name: gcr.io/kaniko-project/executor:debug
     entrypoint: [""]
   rules:
-    - when: manual
+    - if: $TRIGGER_JOB == null
+      when: manual
     - if: $TRIGGER_JOB == $CI_JOB_NAME
       when: always
   script: