refactor(ci): replace inline annotation script with ah-annotations action

Remove the local add-annotations.sh script and the inline tag detection
logic from the release workflow. Use the reusable GitHub Action
volker-raschek/ah-annotations@v0.1.1 which handles tag detection and
changelog generation internally.

Co-authored-by: Copilot <copilot@github.com>

.gitea/workflows/release.yaml

@@ -70,11 +70,7 @@ jobs:
           fetch-depth: 0
 
       - name: Add Artifacthub.io annotations
-        run: |
-          rc_pattern="\-rc([-\.][0-9]+)?$"
-          NEW_TAG="$(git tag --sort=-version:refname | grep --invert-match --perl-regexp "${rc_pattern}" | head --lines 1)"
-          OLD_TAG="$(git tag --sort=-version:refname | grep --invert-match --perl-regexp "${rc_pattern}" | head --lines 2 | tail --lines 1)"
-          .gitea/scripts/add-annotations.sh "${OLD_TAG}" "${NEW_TAG}"
+        uses: volker-raschek/ah-annotations@v0.1.1
 
       - name: Extract meta information
         run: |