Add entrypoint to create a new wallet and start text GUI

Dockerfile

@@ -14,3 +14,6 @@ RUN git submodule update --init
 RUN apt-get install -y libsecp256k1-0
 RUN python3 -m pip install --user . cryptography
 
+ADD ./entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+electrum="/electrum/run_electrum --portable"
+
+$electrum create
+$electrum --gui text