feat: added base-url for compliance reasons

Author: cmeesters

.github/workflows/announce-release.yml

@@ -21,6 +21,7 @@ jobs:
         with:
           access-token: ${{ secrets.MASTODONBOT }}
           pr-title: ${{ github.event.head_commit.message }}
+          base-url: "" # may be empty for our instance
           message: |
             Beep, Beep - I am your friendly #Snakemake release announcement bot.