CI: Move some workflow steps into ci/micropython.sh #878
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For a few reasons:
This changeset also switches to
arm-none-eabi-gcc-action
(instead of apt) to handle installing the ARM GCC toolchain. This uses caching, speeding up the compiler install from 60+ seconds down to about 7 seconds.I have dropped our "deps" step (a pre-requisite of each MicroPython build) in favour of just setting up the environment for each build. This is - in theory - slower, but is much less complicated and less prone to weird errors.