[tests] Run Bitcoin Core and Electrs on Travis

ci/start-core.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+
+set -e
+
+BITCOIN_VERSION=0.20.1
+
+# This should be cached by Travis
+cargo install --git https://github.com/romanz/electrs --bin electrs
+
+curl -O -L https://bitcoincore.org/bin/bitcoin-core-$BITCOIN_VERSION/bitcoin-$BITCOIN_VERSION-x86_64-linux-gnu.tar.gz
+tar xf bitcoin-$BITCOIN_VERSION-x86_64-linux-gnu.tar.gz
+
+export PATH=$PATH:./bitcoin-$BITCOIN_VERSION/bin
+
+bitcoind -regtest=1 -daemon=1 -fallbackfee=0.0002
+until bitcoin-cli -regtest getblockchaininfo; do
+    sleep 1
+done
+
+ADDR=$(bitcoin-cli -regtest getnewaddress)
+bitcoin-cli -regtest generatetoaddress 150 $ADDR
+
+nohup electrs --network regtest --jsonrpc-import --cookie-file /home/travis/.bitcoin/regtest/.cookie &
+sleep 5