Added ci to auto sync with coralmicro.

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This CI is scheduled to run daily that:

• check if there has been changes to coralmicro, if so
• sync with coralmicro's main
• build
• push updates to main

Here is a successful run without updates to coralmicro: https://github.com/google-coral/coralmicro-out-of-tree-sample/actions/runs/3346088090/jobs/5542450761 Here is a simulated run if there are any updates to coralmicro: https://github.com/google-coral/coralmicro-out-of-tree-sample/actions/runs/3346317163/jobs/5542971164.

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per chat with @mbrooksx since this ci is already test the build with coralmicro, we'll allow it to automatically push to main after build succeeds! Here is an example run that was pushed to fake-main: https://github.com/google-coral/coralmicro-out-of-tree-sample/actions/runs/3347762892/jobs/5546100880