Cross-compiling for Embedded arm32 Target (RP2040 / Cortex-M0+)

Since 4.12.0 and Experimental new layout for the ocaml-variants packages in opam-repository the way to install those compilers is:

opam switch create 5.0.0-static \
  --packages=ocaml-variants.5.0.0+options,ocaml-option-static
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