docker-bitcoind
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fix dockerfile
I think this PR changes too many unrelated things at once.
I would instantly agree to some changes, but some I don't, and some I don't really understand.
Not sure what this is fixing, but the assumption is that the shell in use is POSIX compliant. This changes that and assumes it's bash or similar with double brackets at least.
Certainly there are somethings that could be cleaned up or quoted, but a basic POSIX shell is sufficient for the basic stuff going on here.