Revert "(might fail) remove rm rf call"

This reverts commit 22f74ebca7.

action/Dockerfile

@@ -10,10 +10,12 @@ LABEL "repository"="http://github.com/webbertakken/unity-actions"
 LABEL "homepage"="http://github.com/webbertakken/unity-actions"
 LABEL "maintainer"="Webber Takken <webber@takken.io>"
 
-RUN apt-get update
-RUN apt-get upgrade -y --force-yes 
-RUN apt-get install -y --force-yes jq
-
+RUN apt-get update \
+&&  apt-get upgrade -y --force-yes \
+&&  apt-get install -y --force-yes \
+    jq \
+&&  apt-get clean \
+&&  rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/*
 
 ADD steps /steps
 RUN chmod -R +x /steps