add scripts and configuration to deploy with Jenkins Job Builder

These files make it possible to
- build a container image that includes Jenkins Job Builder
- store the container image in the OpenShift ImageStream
- use the container to validate or deploy the Jenkins Jobs

More details about the files are included in the README.md.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

deploy/Dockerfile

@@ -0,0 +1,22 @@
+FROM centos:latest
+
+RUN true \
+ && yum -y install git make python3-pip \
+ && pip3 install jenkins-job-builder \
+ && yum -y clean all \
+ && true
+
+ENV MAKE_TARGET=${MAKE_TARGET:-test}
+
+# Environment that needs to be set before executing checkout-repo.sh
+# ENV GIT_REPO=https://github.com/ceph/ceph-csi
+# ENV GIT_REF=ci/centos
+ADD checkout-repo.sh /opt/build/
+
+# make WORKDIR writable, otherwise git checkout fails
+RUN chmod ugo=rwx /opt/build
+
+ENV HOME=/opt/build
+WORKDIR /opt/build
+
+CMD ["sh", "-c", "./checkout-repo.sh && make -C deploy ${MAKE_TARGET}"]