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>

docker-compose-generator/docker-fragments/opt-add-electrum-ps.yml

@@ -0,0 +1,23 @@
+version: "3"
+
+services:
+  bitcoind:
+    environment:
+      BITCOIN_EXTRA_ARGS: |
+        rpcauth=eps:3d1cff5ee81ddeb3ba94483150310e74$$4626aeb95b2a2b066eac8833c1ad936f65cf7492aa836ec8f173ff65ac428a0e
+  electrum_ps:
+    image: docker.io/peleion/eps-docker
+    restart: unless-stopped
+    ports:
+      - "50002:50002"
+    volumes:
+      - "electrum_ps_datadir:/srv"
+    environment:
+      - HOST=bitcoind
+      - PORT=43782
+      - RPC_USER=eps
+      - RPC_PASSWORD=cmhKyeLSco35KVhecK3blYcHFx73xrJ1fOQtjtmiKks
+      - XPUB=${EPS_XPUB}
+volumes:
+  electrum_ps_datadir:
+