fix(ci): keep optional report extraction non-blocking

scripts/ci-deploy.sh

@@ -101,12 +101,12 @@ DOCKER_BUILDKIT=1 docker build --network=host --progress=plain --cache-from epic
 check_current
 # Read reports from the already-built image; do not start an extra application.
 report_container=""
-if report_container="$(docker create --entrypoint /bin/true "$image")"; then
+if report_container="$(docker create --entrypoint /bin/true "$image")" && [ -n "$report_container" ]; then
   mkdir -p build-reports
-  if docker cp "$report_container:/app/build-reports/." build-reports; then
+  if docker cp "$report_container:/app/build-reports/." build-reports && [ -s build-reports/report.md ]; then
     cat build-reports/report.md
     if [ -n "${GITHUB_STEP_SUMMARY:-}" ]; then
-      cat build-reports/report.md >> "$GITHUB_STEP_SUMMARY"
+      cat build-reports/report.md >> "$GITHUB_STEP_SUMMARY" || echo "Warning: could not append performance summary" >&2
     fi
   else
     echo "Warning: build performance report unavailable" >&2