btrfs-progs: ci: cache built dependencies
authorDavid Sterba <dsterba@suse.com>
Sat, 24 Feb 2018 00:57:42 +0000 (01:57 +0100)
committerDavid Sterba <dsterba@suse.com>
Tue, 6 Mar 2018 10:28:38 +0000 (11:28 +0100)
For a slight speed up of the build, cache reiserfs and zstd. A quick
cache validity is done, or it can be cleared manually on travis web UI.

Signed-off-by: David Sterba <dsterba@suse.com>

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