ci: report per-route JavaScript budgets from Docker build

scripts/ci-deploy.sh

@@ -99,6 +99,22 @@ echo "Building $image"
 DOCKER_BUILDKIT=1 docker build --network=host --progress=plain --cache-from epicnext-cms:latest \
   --build-arg NEXT_DEPLOYMENT_ID="$sha" -t "$image" .
 check_current
+# Read reports from the already-built image; do not start an extra application.
+report_container=""
+if report_container="$(docker create --entrypoint /bin/true "$image")"; then
+  mkdir -p build-reports
+  if docker cp "$report_container:/app/build-reports/." build-reports; then
+    cat build-reports/report.md
+    if [ -n "${GITHUB_STEP_SUMMARY:-}" ]; then
+      cat build-reports/report.md >> "$GITHUB_STEP_SUMMARY"
+    fi
+  else
+    echo "Warning: build performance report unavailable" >&2
+  fi
+  docker rm "$report_container" >/dev/null
+else
+  echo "Warning: could not extract build performance report" >&2
+fi
 pnpm db:migrate
 check_current