perf(ci): use Docker integrated BuildKit

Jenkinsfile

@@ -129,7 +129,7 @@ pipeline {
                 withCredentials([usernamePassword(credentialsId: "${NODE_CREDENTIALS}", usernameVariable: 'JENKINS_NODE_USERNAME', passwordVariable: 'JENKINS_NODE_PASSWORD')]) {
                     sh '''
                         set -euo pipefail
-                        DOCKER_BUILDKIT=0 ./scripts/ci-docker.sh build --network host \
+                        DOCKER_BUILDKIT=1 ./scripts/ci-docker.sh build --network host --progress=plain \
                           --build-arg PIP_INDEX_URL="$PIP_INDEX_URL" \
                           --build-arg HTTP_PROXY="$HTTP_PROXY_URL" --build-arg HTTPS_PROXY="$HTTP_PROXY_URL" \
                           --build-arg NO_PROXY="$NO_PROXY_HOSTS" -t "$IMAGE_REF" .

tests/test_fnos_dependency_script.py

@@ -17,7 +17,7 @@ def test_jenkins_uses_fast_index_for_every_pip_stage() -> None:
 def test_native_amd64_pipeline_does_not_boot_buildx() -> None:
     pipeline = (Path(__file__).parents[1] / "Jenkinsfile").read_text()
     assert 'test "$(uname -m)" = x86_64' in pipeline
-    assert "DOCKER_BUILDKIT=0 ./scripts/ci-docker.sh build" in pipeline
+    assert "DOCKER_BUILDKIT=1 ./scripts/ci-docker.sh build" in pipeline
     assert "buildx" not in pipeline
     assert "--no-cache" not in pipeline