refactor liquid to install latest release

liquid/Dockerfile

@@ -1,20 +1,16 @@
 FROM ubuntu:18.04
 
-RUN apt-get update && apt-get install --yes wget
+RUN apt-get update && apt-get install --yes curl wget
 
-RUN mkdir -p /tmp && wget -qO- https://github.com/Blockstream/liquid/releases/download/liquid.3.14.1.22/liquid-3.14.1.22-x86_64-linux-gnu.tar.gz | tar xvz -C /tmp && \
-  mv /tmp/liquid-3.14.1.22/bin/liquidd /usr/bin/liquidd && \ 
-  mv /tmp/liquid-3.14.1.22/bin/liquid-cli /usr/bin/liquid-cli &&\
-	mv /tmp/liquid-3.14.1.22/bin/liquid-tx /usr/bin/liquid-tx &&\
-  rm -rf /tmp/liquid-3.14.1.22
-
-RUN mkdir -p /config /script
+RUN mkdir -p /tmp /config /script
 
 ADD liquid/config /config
-ADD liquid/run /script
+ADD liquid/script /script
 
 WORKDIR /script
 
+RUN /script/install
+
 EXPOSE 18884
 STOPSIGNAL SIGINT
 

liquid/script/install

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -e
+
+LATEST_VERSION=$(curl --silent "https://api.github.com/repos/blockstream/liquid/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
+VERSION_NAME=$(echo $LATEST_VERSION | sed '1,/\./s/\./\-/')
+
+wget -qO- https://github.com/Blockstream/liquid/releases/download/$LATEST_VERSION/$VERSION_NAME-x86_64-linux-gnu.tar.gz | tar xvz -C /tmp
+
+mv /tmp/$VERSION_NAME/bin/liquidd /usr/bin/liquidd
+mv /tmp/$VERSION_NAME/bin/liquid-cli /usr/bin/liquid-cli
+mv /tmp/$VERSION_NAME/bin/liquid-tx /usr/bin/liquid-tx
+
+rm -rf /tmp