Integrate EPS (Electrum Personal Server) (#227)

* Integrate EPS (Electrum Personal Server)

After the ElectrumX integration in the last release, I thought that some people may prefer the Electrum Personal Server (EPS) approach, which can only serve specific pre-determined wallets (using XPUBS).  EPS cannot serve as a server for ad-hoc wallets with connections for many people, that ElectrumX delivers.  The upside pf EPS is that it is much lighter, and doesn't require txindex=1.

I will integrate it with this pull request, but it might take a while, as I have some busy weeks ahead of me.

* Update opt-add-electrum-ps.yml

* Update opt-add-electrum-ps.yml

* Update opt-add-electrum-ps.yml

* Update opt-add-electrum-ps.yml

* fix persistent data directory

* Break up monolithic bitcoind var

* fix bitcoind daemon name

* Update opt-add-electrum-ps.yml

* Update opt-add-electrum-ps.yml

* Update opt-add-electrum-ps.yml

* Fixed image name

* fixed bitcoind rpc login credentials

* Update opt-add-electrum-ps.yml

* Add $BTCPAY_EPS_XPUB

Add $BTCPAY_EPS_XPUB for Electrum Personal Server Integration

* Update opt-add-electrum-ps.yml

* Update opt-add-electrum-ps.yml

* Update README.md

* Update README.md

* Update build.sh

* Update opt-add-electrum-ps.yml

* Update README.md

Co-authored-by: peleion <github@peleion.com>

build.sh

@@ -32,6 +32,7 @@ docker run -v "$(pwd)/Generated:/app/Generated" \
            -e "BTCPAYGEN_LIGHTNING=$BTCPAYGEN_LIGHTNING" \
            -e "BTCPAYGEN_SUBNAME=$BTCPAYGEN_SUBNAME" \
            -e "BTCPAY_HOST_SSHAUTHORIZEDKEYS=$BTCPAY_HOST_SSHAUTHORIZEDKEYS" \
+           -e "EPS_XPUB=$EPS_XPUB" \
            --rm $BTCPAYGEN_DOCKER_IMAGE
 
 if [ "$BTCPAYGEN_REVERSEPROXY" == "nginx" ]; then