Right now there isn't an option in the YAML to skip steps.
You could try marking the step as 'manual' if it's always going to be the last step, and just require it to be manually triggered.
Or you'll need to add your conditions to the start of the step. You can then just use 'exit 0' to finish the step early with a "successful" status and continue on with the pipeline.
You can also open a feature request for this here: https://jira.atlassian.com/secure/CreateIssue!default.jspa
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