chore: Backport to v5 next staging (#24010)

Author: alexghr

.github/workflows/ci3.yml

@@ -208,15 +208,19 @@ jobs:
       fail-fast: false
       matrix:
         test_set: ["1", "2"]
-    # We run on current nightly tags only, or when the ci-network-scenario label is present in a PR.
+    # We run on the current v5-next nightly tag (private repo only), or when the ci-network-scenario label is present in a PR.
     needs: [ci, validate-nightly-tag]
     if: |
       always()
       && (needs.ci.result == 'success' || needs.ci.result == 'skipped')
       && github.event.pull_request.head.repo.fork != true
       && github.event.pull_request.draft == false
       && (
-        needs.validate-nightly-tag.outputs.is_current == 'true'
+        (
+          needs.validate-nightly-tag.outputs.is_current == 'true'
+          && github.repository == 'AztecProtocol/aztec-packages-private'
+          && startsWith(github.ref_name, 'v5.')
+        )
         || contains(github.event.pull_request.labels.*.name, 'ci-network-scenario')
       )
     steps: