Dockerfile.client, Dockerfile.solana: harden caching to cut CI time #332
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This change attempts to add useful items to the docker caching which should save time downloading crates and by adding path= and dropping id= ensure that no Dockerfile cache mismatches occur. I think the id= param is meant to help group builds that benefit from common cache, but in case of pyth2wormhole-client/SOL contract builds it became a competition between the two replacing the other's caches