Add missing dependencies for docs

roles/openshift-apps/release-monitoring/files/buildconfig.yml

@@ -17,6 +17,7 @@ items:
           license="MIT"
         RUN dnf install -y --enablerepo=updates-testing \
                 git \
+                graphviz \
                 python3-alembic \
                 python3-blinker \
                 python3-dateutil \
@@ -39,6 +40,7 @@ items:
                 python3-wtforms && \
             dnf autoremove -y && \
             dnf clean all -y
+        RUN pip-3 install sqlalchemy_schemadisplay
         RUN git clone https://github.com/release-monitoring/anitya.git && \
                 pushd anitya && \
                 git checkout 0.13.1 && \