Simplify docker config.

Dockerfile

@@ -1,14 +1,11 @@
 FROM ubuntu:20.04
 
-ARG WITH_COINS
-ARG WITHOUT_COINS
-
 ENV LANG=C.UTF-8 \
     DEBIAN_FRONTEND=noninteractive \
     DATADIRS="/coindata"
 
 RUN apt-get update; \
-    apt-get install -y wget python3-pip gnupg unzip protobuf-compiler automake libtool pkg-config;
+    apt-get install -y wget python3-pip gnupg unzip protobuf-compiler automake libtool pkg-config gosu;
 
 RUN wget -O coincurve-anonswap.zip https://github.com/tecnovert/coincurve/archive/anonswap.zip && \
     unzip coincurve-anonswap.zip && \
@@ -21,18 +18,15 @@ RUN cd basicswap-master; \
     protoc -I=basicswap --python_out=basicswap basicswap/messages.proto; \
     pip3 install .;
 
-# Download binaries, these will be part of the docker image
-RUN basicswap-prepare -datadir=/opt -preparebinonly ${WITH_COINS} ${WITHOUT_COINS}
-
-RUN useradd -ms /bin/bash user && \
-    mkdir /coindata && chown user -R /coindata
-
-USER user
-WORKDIR /home/user
+RUN useradd -ms /bin/bash swap_user && \
+    mkdir /coindata && chown swap_user -R /coindata
 
 # Expose html port
 EXPOSE 12700
 
 VOLUME /coindata
 
-ENTRYPOINT ["basicswap-run", "-datadir=/coindata/basicswap"]
+COPY ./docker/entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["basicswap-run", "-datadir=/coindata/basicswap"]