Make it work with docker.com automated builds

Author: nolanpro

Dockerfile

@@ -3,11 +3,15 @@ FROM debian:9.5
 
 # Update packages, then install lua
 RUN apt-get update -qq
-RUN apt-get install -y lua5.3 luarocks liblua5.3-dev build-essential libssl-dev m4
+RUN apt-get install -y lua5.3 luarocks liblua5.3-dev build-essential libssl-dev m4 git
 
 # Copy over our LUA libraries/runtime
 COPY ./src /opt/executor
 
+# Get the sdk repo if it doesn't exist
+WORKDIR /opt/executor
+RUN if [ ! -d "sdk-lua" ]; then git clone --depth 1 https://github.com/ProcessMaker/sdk-lua.git; fi
+
 # Build the sdk and save it in luarocks default folder
 WORKDIR /opt/executor/sdk-lua
 RUN luarocks make --local