Revert "Pull grafyaml from quay.io"

This reverts commit f4d4714cee.

OpenDev is moving back to docker.io to preserve speculative container
image testing.

Depends-On: https://review.opendev.org/c/opendev/grafyaml/+/884291
Change-Id: I6342a19e28d4e3a3f9130c16668d0f4ba2ed7329

doc/source/grafana.rst

@@ -81,7 +81,7 @@ load them.
    $ docker run --rm -t --network=host \
       --env-file ./grafyaml.env \
       -v ./project-config/grafana:/grafana:ro \
-      quay.io/opendevorg/grafyaml
+      docker.io/opendevorg/grafyaml
 
 To work on dashboards, update the ``yaml`` files in ``project-config``
 and re-run the grafyaml import as above, then reload them in the

playbooks/roles/grafana/templates/update-grafana-dashboards.sh.j2

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-docker pull quay.io/opendevorg/grafyaml && \
+docker pull docker.io/opendevorg/grafyaml && \
 docker run --rm -t --network=host \
        --env-file /etc/grafana/secrets/grafyaml.env \
       -v /opt/project-config/grafana:/grafana:ro \
-      quay.io/opendevorg/grafyaml
+      docker.io/opendevorg/grafyaml