X_IMAGE_NOT_PREBUILT
Means
a container role built at boot what the image build should have: island chunks or stylesheets
Typical cause
an image whose Dockerfile predates the prebuilt step, or one built from a context that carried a store for another Bun or framework version
Fix
edit docker/Dockerfile: add RUN bun node_modules/@ultimat3/cli/src/bin.ts build --target prebuilt after COPY . . in the runtime stage, then rebuild the image