fix(ci): make vela_*.bin copy optional in artifact backup

The artifact backup step in ci-tasks tried to copy
cmake_out/*/vela_*.bin for every non-vendor task, but only full-image
configs (goldfish) actually produce vela_*.bin. Configs like qemu-* only
produce the nuttx ELF, so the glob resolves to a literal path, cp fails
with 'No such file or directory', and the whole matrix job is marked
failed even though the build succeeded.

This latent bug was only exposed after #58
introduced qemu builds to the matrix.

Fix: always copy nuttx and .config, then attempt to copy vela_*.bin
separately with '|| true' so missing binaries are ignored.

Seen in:
https://github.com/open-vela/packages_fe_examples/actions/runs/25427679424/job/74586459600

Author: liujinye-sys

.github/workflows/ci.yml

@@ -493,7 +493,10 @@ jobs:
             if [[ "$task" == *:* ]] || [[ "$task" == *vendor/* ]]; then
               cp ${cp_base_dir}/nuttx ${cp_base_dir}/.config $ci_artifact_name
             else
-              cp ${cp_base_dir}/nuttx ${cp_base_dir}/vela_*.bin ${cp_base_dir}/.config $ci_artifact_name
+              cp ${cp_base_dir}/nuttx ${cp_base_dir}/.config $ci_artifact_name
+              # vela_*.bin is optional: only produced by full-image configs
+              # (e.g. goldfish). Configs like qemu-* only produce nuttx ELF.
+              cp ${cp_base_dir}/vela_*.bin $ci_artifact_name 2>/dev/null || true
             fi
 
             echo "=== Cleaning up after $task ==="