[openstreetmap-website] Add Vagrant cachier plugin support if available (#928)

[Grant]

Add vagrant cachier (apt repo caching) plugin support (if available) to speed up re-provisioning.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/928

-- Commit Summary --

  * Add Vagrant cachier plugin support if available

-- File Changes --

    M Vagrantfile (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/928.patch
https://github.com/openstreetmap/openstreetmap-website/pull/928.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/928
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