Install Python in Docker

Necessary for the highlighter

Dockerfile

@@ -3,7 +3,7 @@ FROM debian:sid
 ## dependency installation: nginx, wattsi, and other build tools
 ## cleanup freepascal since it is no longer needed after wattsi build
 RUN apt-get update && \
-    apt-get install -y ca-certificates curl git unzip fp-compiler fp-units-fcl fp-units-net libc6-dev nginx && \
+    apt-get install -y ca-certificates curl git unzip fp-compiler fp-units-fcl fp-units-net libc6-dev nginx python2.7 python-pip && \
     git clone https://github.com/whatwg/wattsi.git /whatwg/wattsi && \
     cd /whatwg/wattsi && \
     /whatwg/wattsi/build.sh && \

ci-deploy/Dockerfile

@@ -7,13 +7,15 @@ RUN apt-get update && \
     fp-compiler fp-units-fcl fp-units-net libc6-dev         \
     default-jre                                             \
     libfontconfig1 libgomp1 libxml2                         \
+    python2.7 python-pip                                    \
     fonts-dejavu fonts-droid-fallback fonts-liberation fonts-symbola fonts-unfonts-core
 
 # Dependency lines above are:
 # - General
 # - Wattsi
 # - validator
 # - Prince
+# - Highlighter
 # - fonts
 
 # Dependecies of prince_11.3-1_debian8.0_amd64.deb (not used) are libc6 libcurl3 libfontconfig1