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Add cargo contract pack command

Created by: Robbepop

The proposed cargo contract pack is going to do the following:

  • Builds the contract: cargo contract build
  • Builds the metadata of the contract: cargo contract metadata
  • After both steps with their respective outputs in the target/ink directory the cargo contract pack command additionally packs the generated contract.wasm into the source.wasm field of the metadata.json file and stores it as contract.pack.

As follow-up the Canvas UI (and eventually Polkadot JS Apps) should build in support for the .pack extension and might even be able to drop support for non packed contracts completely.