.github/workflows/nightly-builds: only run on tektoncd org

It tries to run nightly on my fork, we don't really want that by default.

Signed-off-by: Vincent Demeester <[email protected]>

Author: vdemeester

.github/workflows/nightly-builds.yaml

@@ -28,6 +28,7 @@ jobs:
   build:
     name: Nightly Build (K8s ${{ inputs.kubernetes_version || 'v1.33.x' }})
     runs-on: ubuntu-latest
+    if: github.repository_owner == 'tektoncd'  # do not run this elsewhere
 
     permissions:
       contents: read
@@ -176,4 +177,4 @@ jobs:
             exit 1
           }
 
-          echo "✅ Pipeline Run completed successfully!"
+          echo "✅ Pipeline Run completed successfully!"