Add whitelist for http request in yarn (#491)

Author: brichet

.github/actions/check-release/action.yml

@@ -39,6 +39,7 @@ runs:
         export GITHUB_ACCESS_TOKEN=${{ inputs.token }}
         export RH_RELEASE_URL=${{ steps.prep-release.outputs.release_url }}
         export RH_STEPS_TO_SKIP=${{ inputs.steps_to_skip }}
+        export YARN_UNSAFE_HTTP_WHITELIST=0.0.0.0
         python -m jupyter_releaser.actions.populate_release
 
     - id: finalize-release