Use supported Buildx image loading

Author: chen21019

scripts/check-build-downloads

@@ -177,7 +177,10 @@ require_pattern package/Dockerfile 'org\.opencontainers\.image\.revision="\$\{IM
 require_pattern scripts/package '--build-arg IMAGE_REVISION="\$\{IMAGE_REVISION\}"' "package_revision_build_arg_missing"
 require_pattern scripts/package '--build-arg SOURCE_DATE_EPOCH="\$\{SOURCE_DATE_EPOCH\}"' "package_source_date_epoch_missing"
 require_pattern scripts/package '--build-arg UBUNTU_SNAPSHOT="\$\{UBUNTU_SNAPSHOT\}"' "package_ubuntu_snapshot_missing"
-require_pattern scripts/package 'rewrite-timestamp=true,compatibility-version=20' "reproducible_image_export_missing"
+require_fixed scripts/package 'export SOURCE_DATE_EPOCH' "buildkit_source_date_epoch_missing"
+require_pattern scripts/package '^[[:space:]]+--load[[:space:]]+\\$' "buildx_docker_load_missing"
+require_pattern scripts/package '^[[:space:]]+--tag "\$\{IMAGE\}"[[:space:]]+\\$' "buildx_image_tag_missing"
+reject_pattern scripts/package 'type=docker,dest=' "unsupported_docker_driver_exporter"
 
 require_pattern package/update-platform-ca 'PLATFORM_CA_ROOT:-/var/lib/pasturestack/etc/ssl/ca\.crt' "platform_ca_root_missing"
 require_pattern package/update-platform-ca 'legacy_ca_root="/var/lib/rancher/etc/ssl/ca\.crt"' "legacy_ca_fallback_missing"

scripts/package

@@ -17,22 +17,21 @@ IMAGE_REVISION=${IMAGE_REVISION:-$(git rev-parse HEAD)}
 IMAGE_CREATED=${IMAGE_CREATED:-$(git show -s --format=%cI HEAD)}
 SOURCE_DATE_EPOCH=${SOURCE_DATE_EPOCH:-$(git show -s --format=%ct HEAD)}
 UBUNTU_SNAPSHOT=${UBUNTU_SNAPSHOT:-20260722T164940Z}
-IMAGE_ARCHIVE=$(mktemp "${TMPDIR:-/tmp}/network-plugin-manager-image.XXXXXX.tar")
-trap 'rm -f "${IMAGE_ARCHIVE}"' EXIT
 
 ./scripts/build
 
+export SOURCE_DATE_EPOCH
 docker buildx build \
     --provenance=false \
+    --load \
+    --tag "${IMAGE}" \
     --network "${DOCKER_BUILD_NETWORK:-host}" \
     --build-arg IMAGE_VERSION="${TAG}" \
     --build-arg IMAGE_REVISION="${IMAGE_REVISION}" \
     --build-arg IMAGE_CREATED="${IMAGE_CREATED}" \
     --build-arg SOURCE_DATE_EPOCH="${SOURCE_DATE_EPOCH}" \
     --build-arg UBUNTU_SNAPSHOT="${UBUNTU_SNAPSHOT}" \
-    --output "type=docker,dest=${IMAGE_ARCHIVE},name=${IMAGE},rewrite-timestamp=true,compatibility-version=20" \
     -f package/Dockerfile \
     .
-docker load --input "${IMAGE_ARCHIVE}" >/dev/null
 printf '%s\n' "${IMAGE}" > dist/images
 printf 'Built %s\n' "${IMAGE}"