ci: Auto-detect the architecture for VK ICD filenames.

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5225>
diff --git a/.gitlab-ci/deqp-runner.sh b/.gitlab-ci/deqp-runner.sh
index 1b18bb4..f40b72a 100755
--- a/.gitlab-ci/deqp-runner.sh
+++ b/.gitlab-ci/deqp-runner.sh
@@ -29,7 +29,7 @@
 # Set up the driver environment.
 export LD_LIBRARY_PATH=`pwd`/install/lib/
 export EGL_PLATFORM=surfaceless
-export VK_ICD_FILENAMES=`pwd`/install/share/vulkan/icd.d/"$VK_DRIVER"_icd.x86_64.json
+export VK_ICD_FILENAMES=`pwd`/install/share/vulkan/icd.d/"$VK_DRIVER"_icd.`uname -m`.json
 
 # the runner was failing to look for libkms in /usr/local/lib for some reason
 # I never figured out.