Build base archives for CI in a separate repository

[Zero King]

Hi,

In [1], I patched MacPorts in an attempt to fix a bug (port(1) failed
randomly on Travis). As it seems to be a Travis-specific bug, I plan to
use a separate repository to generate MacPorts archives used in CI and
keep the patch there. This way we can update the CI-specific archives
without a new release in macports-base (e.g. when new releases of macOS
become available on Travis).

[1]: https://github.com/macports-staging/macports-base/commit/282e498ac51ba40bdfd43008ce430ca20a7d54ce#diff-d7db55f70d83fc9dba4ef14de9febe71

-- 
Best regards,
Zero King
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