[Merge] ~3v1n0/ubuntu-dev-tools:ccache-support into ubuntu-dev-tools:master

[Marco Trevisan (Treviño)]

> Maybe this is due to me not being a sbuild user, but can I ask what is
> supposed to create CCACHE_DIR if it doesn't exit, and when that happens?

At this point:

+ sudo install --group=sbuild --mode=2775 -d "$CCACHE_DIR"

It happens on the host side of course
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https://code.launchpad.net/~3v1n0/ubuntu-dev-tools/+git/ubuntu-dev-tools/+merge/401817
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