👷 Don't try to publish an NPM package if it exists already #113
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Motivation
We have a problem when re-running task that if we try to publish a version to npm that does not exist yet, then it fails. However, we want attempts to publish to be idemponent. This will make JSR and npm behave similarly.
Approach
This adds a check step to see if the npm package at the specified name and version already exists. If so, then we skip publishing.