Add Bluesky post plugin (#5156)

.github/release_template.md

@@ -29,5 +29,6 @@
 - [ ] Release the Helm Chart. If renovate has not created the upgrade PR already, manually trigger it from the Dependency Dashboard.
 - [ ] Announce release in relevant chats and on social media platforms
   - [ ] Mastodon (check if already posted from the release pipeline)
+  - [ ] Bluesky (check if already posted from the release pipeline)
   - [ ] Matrix
   - [ ] Twitter

.woodpecker/social.yaml

@@ -24,3 +24,21 @@ steps:
         additional fitting hashtags and emojis to make the post more appealing
 
         The changelog entry: {{ changelog }}
+
+  - name: bluesky-post
+    image: docker.io/woodpeckerci/plugin-bluesky-post
+    settings:
+      app_password:
+        from_secret: bluesky_token
+      identifier: woodpecker-ci.org
+      ai_token:
+        from_secret: openai_token
+      ai_prompt: |
+        We want to present the next version of our app on Mastodon.
+        Therefore we want to post a catching text, so users will know why they should
+        update to the newest version. Highlight the most special features. If there is no special feature
+        included just summarize the changes in a few sentences. The whole text should not be longer than 240
+        characters. Avoid naming contributors from. Use #WoodpeckerCI, #release and
+        additional fitting hashtags and emojis to make the post more appealing
+
+        The changelog entry: {{ changelog }}