feat(action): enable verbose mode for release fetch script

- Adds an environment variable to enable verbose logging
  during the Gitea release fetch script execution.
- Improves debugging and traceability of script actions.

action.yml

@@ -40,6 +40,7 @@ runs:
     - name: Fetch release from Gitea
       shell: bash
       run: |
+        export VERBOSE="true"
         "${{ github.action_path }}/scripts/fetch-gitea-release.sh"
       env:
         GITEA_TOKEN: ${{ inputs.gitea_token }}