The image runs the glibc canvas build now, which needs no ARMv8.2
features, so the Pi 4 gets thumbnails and scanned-PDF rendering back
without a code change: the gate only ever closed for musl on arm64. The
gate's comment, the env example and the getting-started prerequisites
say so, and keep NATIVE_CANVAS as the override. The x64 AVX2 gate stays:
the glibc x64 build rendered a PDF page under an emulated core without
AVX2, but it still carries AVX2 code and that one run does not cover
every path.
Marc-André Bombeck
3d0ae05192