Stop deploying docs on push to main branch

The current behavior is prone to introducing unwanted
drift between docs and latest image. Change deployment
to happen on release only, and leave a workflow_dispatch
for when smaller fixes need to go out without a release.

.github/workflows/deploy-docs.yml

@@ -2,10 +2,7 @@ name: Deploy Documenation site to GitHub Pages
 
 on:
   push:
-    branches: ['main']
-    paths:
-      - 'docs/**'
-      - '.github/workflows/deploy-docs.yml'
+    tags: v**
   workflow_dispatch:
 
 permissions:

docs/how-tos/set-up-notifications.md

@@ -23,7 +23,7 @@ services:
 Notification backends other than email are also supported.
 Refer to the documentation of [shoutrrr][shoutrrr-docs] to find out about options and configuration.
 
-[shoutrrr-docs]: https://shoutrrr.nickfedor.com/v0.10.3/services/overview/
+[shoutrrr-docs]: https://shoutrrr.nickfedor.com/v0.12.0/services/overview/
 
 {: .note }
 If you also want notifications on successful executions, set `NOTIFICATION_LEVEL` to `info`.

docs/reference/index.md

@@ -580,7 +580,7 @@ The values for each key currently match its default.
 
 # Notifications (email, Slack, etc.) can be sent out when a backup run finishes.
 # Configuration is provided as a comma-separated list of URLs as consumed
-# by `shoutrrr`: https://shoutrrr.nickfedor.com/v0.10.3/services/overview/
+# by `shoutrrr`: https://shoutrrr.nickfedor.com/v0.12.0/services/overview/
 # The content of such notifications can be customized. Dedicated documentation
 # on how to do this can be found in the README. When providing multiple URLs or
 # an URL that contains a comma, the values can be URL encoded to avoid ambiguities.