Steem Docker images now support LOWMEM node

Steem Docker images now contain both FULL and LOWMEM nodes:

• /usr/local/bin/steemd - Full node executable (default)
• /usr/local/bin/steemd_lowmem - Low memory node executable
• /usr/local/bin/cli_wallet - Command line interface

Executable can be specified by the STEEMD_EXEC environment variable, for example:

docker run -e "STEEMD_EXEC=/usr/local/bin/steemd_lowmem" teego/steem-wallet

or as a command of a container:

docker run teego/steem-wallet /usr/local/bin/steemd_lowmem

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