fix: logo (#367)

Author: cmeesters

.github/workflows/announce-release.yml

@@ -32,7 +32,7 @@ jobs:
         with:
           access-token: ${{ secrets.MASTODONBOT }}
           pr-title: ${{ github.event.head_commit.message }}
-          image: pr_logo/long_logo_hpc.png
+          image: "long_logo_hpc.png"
           image-description: "Snakemake HPC logo for Mastodon"
           message: |
             Beep, Beep - I am your friendly #Snakemake release announcement bot.