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Note that I will not able to follow up on the reviews for this PR because I'm going on vacation. I put this together before leaving in hopes it'll be easier for someone else to take over this work.
Additionally https://github.com/joao-paulo-parity/polkadot/blob/musl/Dockerfile is the link of where the script was ported from in case something got lost in translation.
Note: As documented in the script, I'm defaulting
POLKADOT_BRANCH
tov0.9.9-1
because lots of jemalloc undefined symbol errors appeared after the switch tikv-jemallocator fork (paritytech/polkadot#3897). Good news is that it's a single error which only happens during the very last step, when it's assembling the binary, and apparently does not seem to be difficult to solve - it might require an upstream PR on https://github.com/tikv/jemallocator though.related to https://github.com/paritytech/release-engineering/issues/193