Add bitcoin config

stage2/08-configure-bitcoind/01-run.sh

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+chmod 644 files/bitcoin.conf
+mkdir ${ROOTFS_DIR}/home/${FIRST_USER_NAME}/bitcoin
+cp files/bitcoin.conf   ${ROOTFS_DIR}/home/${FIRST_USER_NAME}/bitcoin/bitcoin.conf
+

stage2/08-configure-bitcoind/files/bitcoin.conf

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+onion=127.0.0.1:9050
+torcontrol=127.0.0.1:9051
+
+server=1
+rest=1
+
+; Some Pi optimizations
+maxmempool=512
+maxconnections=40
+maxuploadtarget=5000
+
+port=8333
+rpcport=8332
+
+; Prune it up first
+prune=550
+; Temporary solution while we don't have the drives
+; txindex=1
+
+blockfilterindex=1
+peerbloomfilters=0
+addresstype=bech32
+avoidpartialspends=1
+logips=1
+logtimestamps=0
+logthreadnames=1
+nodebuglogfile=1
+
+rpcbind=0.0.0.0
+