Add devel user to run builds in

Unifies and secures the images a bit more

Dockerfile

@@ -63,4 +63,12 @@ RUN apt-get install -y \
         libmagick++-dev \
         imagemagick
 
-VOLUME /deploy
+# Create devel user...
+RUN useradd -m -d /home/devel -u 1000 -U -g 1000 -G users,tty -s /bin/bash devel
+USER devel
+ENV HOME=/home/devel
+WORKDIR /home/devel
+
+# ... but don't use it on the next image builds
+ONBUILD USER root
+ONBUILD WORKDIR /