Allow simulating a trigger

To facilitate testing, we relax the conditionals that control the
pipeline execution.

This commit will be reverted before merging.

.buildkite/pipeline.yml

@@ -10,6 +10,7 @@ steps:
       // Only run when triggered from Unified Release or via PRs targetting main or release branches
       (
         ( ( build.branch == 'main' || build.branch =~ /^[0-9]+\.[0-9]+\$/ ) && build.env("BUILDKITE_TRIGGERED_FROM_BUILD_PIPELINE_SLUG") == "unified-release-snapshot" ) ||
+        ( build.branch == 'honor-version-from-stack-url' ) ||
         ( build.env("BUILDKITE_PULL_REQUEST") != "false" && ( build.env("BUILDKITE_PULL_REQUEST_BASE_BRANCH") == 'main' || build.env("BUILDKITE_PULL_REQUEST_BASE_BRANCH") =~ /^[0-9]+\.[0-9]+\$/ ) )
       )
     steps:
@@ -26,7 +27,7 @@ steps:
         if: |
           // Only run when triggered from Unified Release and not from PRs
           (
-            ( build.branch == 'main' || build.branch =~ /^[0-9]+\.[0-9]+\$/ ) &&
+            ( build.branch == 'main' || build.branch =~ /^[0-9]+\.[0-9]+\$/ || build.branch == 'honor-version-from-stack-url') &&
             build.env("BUILDKITE_TRIGGERED_FROM_BUILD_PIPELINE_SLUG") == "unified-release-snapshot"
           )
         command: ".buildkite/scripts/dra-publish.sh"