Add D workflow

[Geod24]

Description (and commit message):

D is a statically and strongly typed, multi-paradigm, general-purpose native programming language.
D is fully open-source and maintained by a volunteer community.
For more information, see https://dlang.org

This patch adds a minimal workflow that allows users to compile D projects that use DUB,
the official D package manager and build tool.

The workflow uses the community-maintained `setup-dlang` action,
which can install any version of `dmd` (the reference compiler),
or `ldc` (the LLVM-based, performance oriented compiler,
on any of the three platforms currently supported by Github free runners.
Support for GDC is not yet implemented.

The logo used (d.svg) originates from
https://github.com/dlang/dlang.org/blob/master/images/dlogo_2015.svg
and is available under the BSL-1.0 license
(https://github.com/dlang/dlang.org/blob/master/LICENSE.txt)

Co-Authored-By: Mathias Lang <pro.mathias.lang@gmail.com>

I believe this satisfies all the requirements set forth by the contributing guidelines.

It does use an external action, which was the blocker in the previous attempt (#74), but according to the current guidelines this is tolerated if the disclaimer message is present (which I added).
I also used the hash, as requested in the guideline, despite it being very user-unfriendly. The release used is here:
https://github.com/dlang-community/setup-dlang/releases/tag/v1.0.0

Official website: https://dlang.org/
Official Github organization: https://github.com/orgs/dlang
Action being used: https://github.com/dlang-community/setup-dlang

You can see that the action is in a different organization, however that is simply to simplify access management. As you can see I am a member of both organizations.

As a side note:

• it would be very nice if we could benefit from the same exemption as Terraform (which also doesn't have the disclaimer, BTW);
• The guidelines don't mention what OS the action should run on. I went with the same bet and used ubuntu-latest, like almost everyone else;

[wilzbach]

Shouldn't we use master directly if this is the template for users and they have to trust setup-dlang either way? (and if they are really worried they can always lock the version).
The way I see it this might hurt the standard user as he won't be able to receive any bugfix to the build pipeline.

[Geod24]

Unfortunately that's the way the guidelines want it to be: https://github.com/actions/starter-workflows/blob/0170fa5239991d2141e572a1b334ea577ea4f060/.github/pull_request_template.md

[Kraisornbiinthi]

[Geod24]

Rebased on master. Ping @ethomson @andymckay .

[Geod24]

Rebased on master. @jclem : Any chance you could review this ?

[Geod24]

Rebased / retargeted. Is anything else missing ?

[perwy19]

ฉันไม่รู้ ในวันที่ พ. 29 ก.ค. 2020 10:12 Mathias LANG <notifications@github.com> เขียนว่า:

…

Rebased / retargeted. Is anything else missing ? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#546 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/APEUXW2MFBBTJFU33H6WOGDR56HQTANCNFSM4N3LORWQ> .

[Geod24]

Rebased on main. Shall I try ping another contributor ? Perhaps @imjohnbo ?
It'd be great to know what is holding this PR back, considering it's carefully following all the guidelines.

[andymckay]

So sorry for the delay @Geod24. I think this is good to merge.

[Geod24]

@andymckay : Thanks!

[Geod24]

@andymckay : Any update on the guidelines regarding versions ? This uses the hash, as prescribed by this repository's documentation, but most other places do not. I've listed a few examples here.

[andymckay]

@Geod24 most of those are referencing actions from partners and have different guidelines. I think one or two did slip through the net and we should review those to match the new guidelines. Thank you for the heads up on that.