Escalate privileges to test single user installation

tests/dockerfiles/debian8/Dockerfile

@@ -1,9 +1,7 @@
 FROM debian:8
 
-RUN useradd -ms /bin/bash user
-
-RUN apt-get update && \
-		apt-get install -y \
+RUN apt-get update \
+		&& apt-get install -y \
 			curl \
 			build-essential \
 			libbz2-dev \
@@ -19,4 +17,7 @@ WORKDIR /opt/
 COPY build /opt/build
 RUN  bash build
 
+RUN useradd -ms /bin/bash user \
+		&& echo 'user ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers
+
 CMD ["/sbin/init"]