Ensure outdated packages get removed from the cache #62
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If a package has a new version released upstream the prior version will remain in the cache. Similarly if a package has any dependencies changed to a different package or removed, those unneeded packages will remain in the cache as well. Due to this the slug size will slowly balloon overtime as long as the stack or Aptfile is not changed. This tracks the packages that are downloaded during installation and removes all debs not in that list from the cache archive. `apt-get autoclean` is not used because it will only clean out packages that can no longer be downloaded so not all outdated versions will be removed. If the cache has version 1, 2, and 3 of a package in it and version 1 is removed from upstream then version 1 will be removed but 2 will remain.
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If a package has a new version released upstream the prior version
will remain in the cache. Similarly if a package has any
dependencies changed to a different package or removed, those
unneeded packages will remain in the cache as well. Due to this
the slug size will slowly balloon overtime as long as the stack
or Aptfile is not changed.
This tracks the packages that are downloaded during installation
and removes all debs not in that list from the cache archive.
apt-get autocleanis not used because it will only clean outpackages that can no longer be downloaded so not all outdated
versions will be removed. If the cache has version 1, 2, and 3
of a package in it and version 1 is removed from upstream
then version 1 will be removed but 2 will remain.
Relates to #61