ci: switch to lavapipe

Author: Firestar99

.github/workflows/ci.yaml

@@ -165,8 +165,8 @@ jobs:
           stripdown: true
 
           # FIXME(eddyb) consider using lavapipe instead, or even trying both.
-          install_swiftshader: true
-          # install_lavapipe: true
+          # install_swiftshader: true
+          install_lavapipe: true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - if: ${{ runner.os == 'Linux' }}