fix: install libreadline-dev on CI

[luau-project]

Description

Recently, GitHub updated their Ubuntu runners labeled as ubuntu-latest to run under Ubuntu 24.04.

Note

Previously, ubuntu-latest ran on Ubuntu 22.04.

Due this change, the package libreadline-dev is not installed anymore by default, causing the current (Ubuntu) CI to fail while building Lua even for unrelated changes (notably #331), because readline is missing in the system.

Changes

• Added a step to install libreadline-dev before the build of Lua on (Ubuntu) CI;
• Minor edits in the (Ubuntu) CI regarding the LUA_VERSION environment variable;
• Updated MSVC CI to use the latest LuaInstaller version to install Lua (Release notes).

[luau-project]

This PR is on hold for now. On my personal fork just before opening the PR (with a small modification to CI run on any branch), I didn't get any issue (check https://github.com/luau-project/lgi/actions/runs/12501449208).

There seems to be some strange behavior going on Mesa VK, which I'm searching on the internet.

[luau-project]

Update

TLDR;

the solution is to force software rendering on CI.

In-depth explanation

Note

In my fork, even though the jobs were running on images defined as ubuntu-latest, they were in fact ran on Ubuntu 22.04 (GitHub is in the transition process). This is the reason I didn't catch the error on my fork's CI.

Analyzing the upstream discussion at https://gitlab.freedesktop.org/mesa/mesa/-/issues/10293, and inspecting the diffs of related merges https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27836/diffs, I found that forcing software rendering on Ubuntu 24.04 would solve the problem.

Thus, at top, the following excerpt forces software rendering.

env:
  # Force software rendering on CI, because
  # we were getting a CI error on Ubuntu 24.04 as follows:
  #   MESA: error: ZINK: vkCreateInstance failed (VK_ERROR_INCOMPATIBLE_DRIVER))
  # For more information, see https://github.com/lgi-devs/lgi/pull/332
  LIBGL_ALWAYS_SOFTWARE: 1

As you can see, it worked fine on Ubuntu 24.04 https://github.com/lgi-devs/lgi/actions/runs/12502953910/job/34882613489#step:1:4.

In my view, the PR is ready for review.

[psychon]

Thanks for investigating and fixing this!