| 123456789101112131415161718 | FROM alpine:3.12# > All command-line options (except for '-datadir' and '-conf') may be specified in a configuration fileENV DATA_DIR_PATH=/var/lib/bitcoinARG BITCOIN_CORE_PACKAGE_VERSION=0.19.1-r0# > Executing bitcoin-0.19.1-r0.post-install# > Generated random user / password / port in: /etc/bitcoin.confRUN apk add --no-cache bitcoin=$BITCOIN_CORE_PACKAGE_VERSION \    && rm /etc/bitcoin.conf \    && mkdir "$DATA_DIR_PATH" \    && chown -c bitcoin "$DATA_DIR_PATH"VOLUME $DATA_DIR_PATHUSER bitcoinEXPOSE 8333/tcp# json-rpc apiEXPOSE 8332/tcpCMD ["sh", "-c", "exec bitcoind -datadir=\"$DATA_DIR_PATH\" -rpcbind=0.0.0.0 -rpcallowip=172.16.0.0/12"]
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