webkitgtk: Add /run/opengl-driver to bubblewrap bind mounts

[talyz]

Motivation for this change

Without access to the /run/opengl-driver directory, webkit fails to create an EGL context, since it can't identify a suitable EGL
vendor. This results in a blank window and the following error output:

Cannot get default EGL display: EGL_BAD_PARAMETER
Cannot create EGL context: invalid display (last error: EGL_SUCCESS)

Fixes #98819 and possibly #32580.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[worldofpeace]

Yep, makes total sense.

[austinbutler]

After 2.5h compilation process, I can confirm this fixes my issues on Intel graphics, at least.

The following works fine and results in no error output when visiting my previous test case sites of Facebook, Messenger, and Hangouts.

WEBKIT_DISABLE_COMPOSITING_MODE=0 epiphany

[worldofpeace]

What about without setting that? We'd want it to work as intended

[austinbutler]

What about without setting that? We'd want it to work as intended

It works both ways, I just wanted to show that under normal circumstances when WEBKIT_DISABLE_COMPOSITING_MODE is set to 0 (the default) it works fine, meaning the workaround of enabling WEBKIT_DISABLE_COMPOSITING_MODE is not needed, at least on my hardware.

[worldofpeace]

@austinbutler Gotcha, thanks.

[worldofpeace]

@talyz If you could open a backport PR that would be great. We could possibly readd epiphany now.

[talyz]

@worldofpeace I opened two new PRs, one to revert the epiphany removal (#108107) and another to backport both that and this one (#107981).