github: autolabel PRs

... starting with dashboard ones.

Requires https://github.com/marketplace/actions/labeler

Signed-off-by: Ernesto Puerta <epuertat@redhat.com>
(cherry picked from commit 298bc67)

.github/CODEOWNERS

@@ -3,8 +3,7 @@
 /qa/suites/rados/dashboard                      @ceph/dashboard
 /qa/tasks/mgr/test_dashboard.py                 @ceph/dashboard
 /qa/tasks/mgr/dashboard                         @ceph/dashboard
-/monitoring/grafana                             @ceph/dashboard
-/monitoring/prometheus                          @ceph/dashboard
+/monitoring                                     @ceph/dashboard
 /doc/mgr/dashboard.rst                          @ceph/dashboard
 
 # Dashboard API team

.github/labeler.yml

@@ -0,0 +1,10 @@
+dashboard:
+  - /src/pybind/mgr/dashboard/**
+  - /qa/suites/rados/dashboard/**
+  - /qa/tasks/mgr/test_dashboard.py
+  - /qa/tasks/mgr/dashboard/**
+  - /monitoring/**
+  - /doc/mgr/dashboard.rst
+
+CI:
+  - /.github/**

.github/workflows/labeler.yml

@@ -0,0 +1,11 @@
+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@main
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"