install ansible via apt

debian-8/Dockerfile

@@ -11,11 +11,9 @@ RUN apt-get -q update \
       git \
       apt-utils \
       curl \
+      ansible \
     && curl -L https://github.com/aelsabbahy/goss/releases/latest/download/goss-linux-amd64 -o /usr/local/bin/goss \
     && chmod +rx /usr/local/bin/goss \
-    && apt-get clean \
-    && pip3 install --upgrade pip
-
-RUN pip3 install ansible
+    && apt-get clean 
 
 CMD ["ansible-playbook", "--help"]