[MacPorts] #70365: mprsyncup: deploy RELEASE_URL

[MacPorts]

#70365: mprsyncup: deploy RELEASE_URL
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 Reporter:  jmroot          |      Owner:  admin@…
     Type:  enhancement     |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  server/hosting  |    Version:
 Keywords:                  |       Port:
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 The new selfupdate code will check for RELEASE_URL on GitHub first, but in
 case of GitHub downtime and for systems too old to access GitHub, it
 should also be made available under `distfiles.macports.org/MacPorts/`.

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Ticket URL: <https://trac.macports.org/ticket/70365>
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