ci/bare-metal: Avoid a bug in armhf stripping causing tempfiles in artifacts.

We're failing to strip, so at least try not to leave a million tempfiles
around.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20302>

.gitlab-ci/build/gitlab-ci.yml

@@ -394,6 +394,9 @@ debian-armhf:
       -D llvm=disabled
       -D valgrind=false
     MINIO_ARTIFACT_NAME: mesa-armhf
+    # The strip command segfaults, failing to strip the binary and leaving
+    # tempfiles in our artifacts.
+    ARTIFACTS_DEBUG_SYMBOLS: 1
   script:
     - .gitlab-ci/meson/build.sh
     - .gitlab-ci/prepare-artifacts.sh