gitlab-ci: do not clone git-repo for test-job

The only thing we really need from the git-repo is the piglit_run.ps1
script, so let's upload that into our artifacts instead.

Fixes: d560addc30 ("gitlab-ci: run piglit on windows")
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7867>

.gitlab-ci.yml

@@ -821,11 +821,12 @@ test-d3d12-windows:
   needs:
     - meson-windows-vs2019
   variables:
+    GIT_STRATEGY: none # testing doesn't build anything from source
     GALLIUM_DRIVER: d3d12
     PIGLIT_PROFILE: quick_gl
     PIGLIT_OPTIONS: -x nv_copy_depth_to_color
   script:
-    - . .\.gitlab-ci\windows\piglit_run.ps1
+    - . _install/piglit_run.ps1
   artifacts:
     when: on_failure
     name: "mesa_${CI_JOB_NAME}"

.gitlab-ci/windows/mesa_build.ps1

@@ -17,3 +17,5 @@ if (!$buildstatus) {
   Write-Host "Mesa build or test failed"
   Exit 1
 }
+
+Copy-Item ".\.gitlab-ci\windows\piglit_run.ps1" -Destination $installdir