add .redhat-ci.yml and .redhat-ci.Dockerfile

Add a YAML file for the new Red Hat CI framework.

Rather than re-installing all the build deps everytime, which takes
time, I added a Dockerfile that we can wire up to the Docker Hub. For
now it lives at `jlebon/ostree-tester:rhci`, but we can move it under
the `projectatomic` org (or a new `ostree` org).

Closes: #535
Approved by: cgwalters

.redhat-ci.Dockerfile

@@ -0,0 +1,21 @@
+FROM fedora:24
+MAINTAINER Jonathan Lebon <jlebon@redhat.com>
+
+RUN dnf install -y \
+        gcc \
+        sudo \
+        which \
+        attr \
+        fuse \
+        gjs \
+        parallel \
+        gnome-desktop-testing \
+        redhat-rpm-config \
+        elfutils \
+        'dnf-command(builddep)' \
+ && dnf builddep -y \
+        ostree \
+ && dnf clean all
+
+# create an unprivileged user for testing
+RUN adduser testuser