Bug#930487: lintian: use GitLab caching of test packages to speed up test suite CI

["Chris Lamb" <lamby@debian.org>]

Felix Lechner wrote:

> > caching the result of the former if the tests and some other key files
> > have not changed.
> 
> Will it also force an update of the test packages when the build chain
> has changed? It may expose Lintian bugs like #932339.

Whilst my *current* implementation does not rebuild if a build-depends
version changes, we would only need to include these package version
in the hash key. It would then (correctly) cache miss in that instance
and rebuild the test packages. It's a shame we would not have
a .buildinfo file at this point...

I'm not going to implement this bit just yet until I solve the more
deeper problem of it, well, not actually caching anything at the
moment. See previous messages for more background.


Regards,

-- 
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     : :'  :     Chris Lamb
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