Add bitcoincash support for prepare and run scripts, add bitcoincash to testing suite, groundwork for bch-xmr atomic swap protocol

docker/production/bitcoincash/Dockerfile

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+# https://github.com/NicolasDorier/docker-bitcoin/blob/master/README.md
+
+FROM i_swapclient as install_stage
+
+RUN basicswap-prepare --preparebinonly --bindir=/coin_bin --withcoin=bitcoincash --withoutcoins=particl && \
+    find /coin_bin -name *.tar.gz -delete
+
+FROM debian:bullseye-slim
+COPY --from=install_stage /coin_bin .
+
+ENV BITCOIN_DATA /data
+
+RUN groupadd -r bitcoin && useradd -r -m -g bitcoin bitcoin \
+    && apt-get update \
+    && apt-get install -qq --no-install-recommends gosu \
+    && rm -rf /var/lib/apt/lists/* \
+    && mkdir "$BITCOIN_DATA" \
+    && chown -R bitcoin:bitcoin "$BITCOIN_DATA" \
+    && ln -sfn "$BITCOIN_DATA" /home/bitcoin/.bitcoin \
+    && chown -h bitcoin:bitcoin /home/bitcoin/.bitcoin
+VOLUME /data
+
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
+
+EXPOSE 8332 8333 18332 18333 18443 18444
+CMD ["/bitcoin/bitcoind", "--datadir=/data"]

docker/production/bitcoincash/entrypoint.sh

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+#!/bin/bash
+set -e
+
+if [[ "$1" == "bitcoin-cli" || "$1" == "bitcoin-tx" || "$1" == "bitcoind" || "$1" == "test_bitcoin" ]]; then
+	mkdir -p "$BITCOIN_DATA"
+
+	chown -h bitcoin:bitcoin /home/bitcoin/.bitcoin
+	exec gosu bitcoin "$@"
+else
+	exec "$@"
+fi