Add lua-module for signing

Dockerfile

@@ -27,7 +27,8 @@ RUN wget https://github.com/simpl/ngx_devel_kit/archive/v0.3.0.tar.gz -O ngx_dev
     mkdir luajit2 && \
     tar xf luajit2.tar.gz -C luajit2 --strip-components=1 && \
     cd /tmp/luajit2 && \
-    make && \make install
+    make && \
+    make install
 
 
 # Build Nginx
@@ -55,6 +56,7 @@ RUN ln -sf /dev/stdout /var/log/nginx/access.log \
 
 # Apply Nginx config
 ADD nginx.conf /etc/nginx/nginx.conf
+ADD sign.lua sha256.lua /tmp/lua/
 ADD start.sh /start.sh
 
 # Set default command