gitlab-ci: Use separate arm64 build/test docker images
The image used for test jobs is only about 25% as big as before, which may help avoid some issues with some of the test boards.
Inspired by #2046 (closed) .
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The image used for test jobs is only about 25% as big as before, which may help avoid some issues with some of the test boards.
Inspired by #2046 (closed) .