ci: Begin continuous integration setup

ci/Dockerfile

@@ -0,0 +1,14 @@
+FROM fedora:27
+
+RUN dnf install -y \
+	ansible \
+	openssh-clients \
+	python2-netaddr
+
+# XXX These UID/GIDs must match the Jenkins UID/GID on the agent
+RUN groupadd -g 992 jenkins
+RUN useradd -u 995 -g jenkins -c Jenkins -d /var/lib/jenkins -m jenkins
+
+RUN install -m 700 -o jenkins -g jenkins -d /var/lib/jenkins/.ssh
+COPY known_hosts /var/lib/jenkins/.ssh/
+RUN chown jenkins:jenkins /var/lib/jenkins/.ssh/known_hosts