vanilla: Add GHC 9.8.4

[bgamari]

Bindist installation workflow:
https://github.com/haskell/ghcup-metadata/actions/runs/12089659430

[bgamari]

I have no explanation for why GitHub refuses my commit's signature; I have explicitly overridden the authorship metadata to precisely match that of my public key, the key is associated with my GitHub account, GitHub seemingly recognizes the key as the signing key, and I can readily verify the signature locally.

[phadej]

I give you a hint:

commit 71ee9b5e5e48d45651547cf0cc00b1ed1960dc91 (origin/wip/ghc-9.8.4)
Author: Benjamin Gamari <[email protected]>
Commit: Ben Gamari <[email protected]>

[bgamari]

I give you a hint:

commit 71ee9b5e5e48d45651547cf0cc00b1ed1960dc91 (origin/wip/ghc-9.8.4)
Author: Benjamin Gamari <[email protected]>
Commit: Ben Gamari <[email protected]>

Oh bah. I neglected to consider that --author wouldn't override the committer name.

[bgamari]

The commit signature should now be valid.

[hasufell]

delete

[bgamari]

This disagrees with the filename of dlUri; is this okay?

[hasufell]

The main point of dlOutput is to avoid collisions in case the dlUri is not unique enough.

[bgamari]

Okay, this is useful information.

The natural next question is then: how would one find this out? Is the format of this file documented somewhere?

[hasufell]

All normal bindists are unique, because they contain information on:

• version
• architecture
• platform
• distro

I have not seen an overlap in bindist names so far from GHC pipeline.

This was added for cross bindists afair that had no unique names.

[hasufell]

https://github.com/haskell/ghcup-metadata/actions/runs/12134176871