Add SLURP mark for Releases page template

This patch adds to the Releases page template the possibility to
indicate whether a release is a SLURP release.

Change-Id: Ie0dcddfe271e8fd77a6d40fa54c8ef2ee6914b78

data/series_status.yaml

@@ -1,6 +1,7 @@
 ---
 - name: antelope
   status: development
+  slurp: yes
   initial-release: 2023-03-22
   next-phase:
     status: maintained

doc/source/_themes/releases/series_status_table.tmpl

@@ -17,7 +17,9 @@
      * EOL Date
 {%- for series in data %}
    - * :doc:`{{ series['name'] }}/index`
-     * {{ phase_link(series['status']) }} {%- if series['status'] == 'extended maintenance' %} (see :ref:`note <extended-maintenance-note>` below) {%- endif %}
+       {%- if 'slurp' in series %}   (:ref:`SLURP <slurp>`) {%- endif %}
+     * {{ phase_link(series['status']) }}
+       {%- if series['status'] == 'extended maintenance' %} (see :ref:`note <extended-maintenance-note>` below) {%- endif %}
      * {{ series['initial-release'] }} {%- if series['status'] in ['development', 'future'] %} *estimated* :doc:`(schedule) <{{ series['name'] }}/schedule>`{%- endif %}
      * {% if series['next-phase'] %}{{ phase_link(series['next-phase']['status']) }} *{% if 'date' in series['next-phase'] %}estimated {{ series['next-phase']['date'] }}{% else %}TBD{% endif %}*{% endif %}
      * {{ series.get('eol-date', '') }}

doc/source/index.rst

@@ -77,6 +77,18 @@ You can find their releases listed here:
 
    independent
 
+.. _slurp:
+
+Releases with Skip Level Upgrade Release Process (SLURP)
+========================================================
+
+Releases can be marked as `Skip Level Upgrade Release Process`_ (or
+`SLURP`) releases. This practically means, that upgrades will be
+supported between these (`SLURP`) releases, in addition to between
+adjacent major releases.
+
+.. _Skip Level Upgrade Release Process: https://governance.openstack.org/tc/resolutions/20220210-release-cadence-adjustment.html
+
 Teams
 =====
 

openstack_releases/series_status_schema.yaml

@@ -25,6 +25,8 @@ items:
         - extended maintenance
         - unmaintained
         - end of life
+    slurp:
+      type: "string"
     initial-release:
       type: "date"
     eol-date: