Checkout upstream/stable instead of LATEST

[wilzbach]

From the private mail conversation:

Hi all,
It often happens that someone finds a typo in the docs or other Ddoc
weirdness. At the moment, it takes about a month for this fix to
reach dlang.org.
We already have the version chooser with master/stable and the last
releases at docarchives.dlang.io.
So what do you think about building from upstream/stable instead of
the latest release?
Any thoughts on this one? As mentioned it would be cool to see fixed typos going live immediately and not after one month.
Sorry for the late answer. I think that's a fine idea. -- Andrei

This also brings it in more accordance to the version chooser:

[dlang-bot]

Thanks for your pull request, @wilzbach!

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[wilzbach]

AFAICT nothing outside of dlang.org is depending on this target.
All distros use the docs built in the release archive and the release archive uses it's own release build here.

[andralex]

nice

[CyberShadow]

Something has gone terribly wrong. Just a short excerpt from the VERY LARGE log file:

.generated/stable_dmd-2.077.1/dmd2/linux/bin64/dub(22666:4805)[error]: Declaration expected

[wilzbach]

Just a short excerpt from the VERY LARGE log file:

Ouch 143M log file??

Fixed & this is passing now, but it seems that the assert->rewrite pipeline isn't working correctly anymore :/

[wilzbach]

but it seems that the assert->rewrite pipeline isn't working correctly anymore :/

Luckily I have been working on a separate PR that simplifies this pipeline: #2069 - this should help this PR too.

[wilzbach]

Argh. I realized a big problem with this. We can't do this within the two weeks before release where master got merged into stable, but didn't get fully released yet.

We could check that with https://raw.githubusercontent.com/dlang/dmd/stable/VERSION == git ls-remote --tags https://github.com/dlang/dmd | sed 's/.*refs\/tags\/\([a-z0-9.-]*\).*/\1/' | sort -r | head -n1 though ...