Add 8.10 support / testing.

[Zimmi48]

Update to the latest versions of template, and switch opam files to 2.0.

[Zimmi48]

The new 8.10 testing does not work because there is no released version of math-classes that is compatible with Coq 8.10. See rocq-community/math-classes#74.

[Zimmi48]

@erikmd Can you help me understand the issue here? I added a test with the Coq 8.10 Docker image, and it fails in the following way:

+ (/bin/bash @ line 6) $ opam pin add coq-corn . -y -n -k path
[coq-corn.dev: rsync]
[coq-corn.dev] synchronised from file:///home/coq/coq-corn
coq-corn is now pinned to file:///home/coq/coq-corn (version dev)
+ (/bin/bash @ line 7) $ opam install coq-corn -y -j 2 --deps-only
<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[coq-corn.dev] no changes from file:///home/coq/coq-corn
The following dependencies couldn't be met:
  - coq-corn -> coq >= dev
      not available because the package is pinned to version 8.10+beta2
No solution found, exiting

This seems weird: the opam file gives the following constraint on Coq:

   "coq" {(>= "8.6" & < "8.11~") | (= "dev")}

I would have thought that it would pick 8.10+beta2 has a version of Coq satisfying this constraint...

[erikmd]

Hi @Zimmi48, I think this is because you named the .opam file corn.opam instead of coq-corn.opam, so when the install is requested, opam finds the wrong specification (namely that of the repo extra-dev, which is loaded in the coqorg/coq:8.10 image currently because 8.10 is a pre-release).

[Zimmi48]

Right my bad! Thanks a lot.

[Zimmi48]

It looks like it worked.

[Zimmi48]

Looks like we forgot to merge this.