Add offline announcement setting

app/views/layouts/_offline_flash.erb

@@ -1,5 +1,17 @@
-<% if %w[database_offline api_offline].include? Settings.status %>
-  <%= t(".osm_offline") %>
-<% elsif %w[database_readonly api_readonly].include? Settings.status %>
-  <%= t(".osm_read_only") %>
-<% end %>
+<div class="d-flex flex-column gap-2">
+  <% if %w[database_offline api_offline].include? Settings.status %>
+    <p class="mb-0">
+      <%= t(".osm_offline") %>
+    </p>
+  <% elsif %w[database_readonly api_readonly].include? Settings.status %>
+    <p class="mb-0">
+      <%= t(".osm_read_only") %>
+    </p>
+  <% end %>
+
+  <% if Settings.status_announcement_url %>
+    <p class="mb-0">
+      <%= link_to t(".announcement"), Settings.status_announcement_url %>
+    </p>
+  <% end %>
+</div>

config/locales/en.yml

@@ -1587,6 +1587,7 @@ en:
     offline_flash:
       osm_offline: "The OpenStreetMap database is currently offline while essential database maintenance work is carried out."
       osm_read_only: "The OpenStreetMap database is currently in read-only mode while essential database maintenance work is carried out."
+      announcement: "You can read the announcement here."
   user_mailer:
     diary_comment_notification:
       description: "OpenStreetMap Diary Entry #%{id}"

config/settings.yml

@@ -23,6 +23,8 @@ api_version: "0.6"
 #   database_offline - database offline with site in emergency mode
 #   gpx_offline - gpx storage offline
 status: "online"
+# Application status announcement url added to offline flash messages
+#status_announcement_url: "https://en.osm.town/@osm_tech"
 # The maximum area you're allowed to request, in square degrees
 max_request_area: 0.25
 # Number of GPS trace/trackpoints returned per-page