Support gradle 8

[heojay]

Resolves #921

• Since gradle nixpkg supports the gradle 8 version, I think we can do the same with nixpacks.
  • https://search.nixos.org/packages?channel=23.05&show=gradle&from=0&size=50&sort=relevance&type=packages&query=gradle

[coffee-cup]

I suspect that this doesn't work correctly because we are on an older version of the Nixpacks archive. Can you please add a test to check if Gradle 8 is correctly used.

[heojay]

@coffee-cup Ok, I will add the test using gradle 8.

[heojay]

I don't know much about both zig and gyro, but the reason why the zig-gyro test fails in CI seems to be due to the inaccessibility of the astrolabe.pm specified in the file below.

https://github.com/railwayapp/nixpacks/blob/b0b8cd4874ca75ab1f512d92e5f4503f21a0c611/examples/zig-gyro/gyro.lock#L1

[Miloas]

I guess thats because zig 0.11 break the gyro. (gyro is archived, so I think the author wont fix this) Maybe we can pin zig version to 0.10.1 for gyro project and also add support for zig official package manager

[coffee-cup]

The version of gradle that is actually being installed is Gradle 7 since the Nix archive version is not up to date.

If possible, can you do something like this https://github.com/railwayapp/nixpacks/blob/main/src/providers/elixir.rs#L14 to manually set the archive version to one with Gradle 8.

[heojay]

@coffee-cup Thanks for your comment, I will take a look.

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[heojay]

@coffee-cup Sorry, but could you please check this PR? Thank you.