merge (insted of replace) URLs specified via PANTS_BOOTSTRAP_URLS
#474
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Users can use
PANTS_BOOTSTRAP_URLSto add custom versions of Pants to those known byscie-pants. To do so, however, users must provide all of the existingptexkeys obtained viaSCIE=inspect pants | jq .ptexfor each supported platform since specifyingPANTS_BOOTSTRAP_URLSreplaces all existing URLs. Only then can the user supplement the URLs with their own. (The "built-in" URLs are for Python Build Standalone releases known toscie-pants.)This is unwieldy especially if the user does not have access to all of the supported platforms.
scie-pantsshould instead just merge the configuration provided viaPANTS_BOOTSTRAP_URLS. This should be a more intuitive behavior for users. Also, if users did wish to replace the existing ptex URLs for PBS Pythons, the merged configuration will override built-in URLs with the user's URLs if there is a conflict.)