Allow coverage badge step to fail gracefully

The badge step requires a GIST_SECRET and real gist ID that aren't
configured yet. Adding continue-on-error prevents this from failing
the entire CI workflow.

Author: bloo-berries

.github/workflows/ci.yml

@@ -43,6 +43,7 @@ jobs:
 
     - name: Update coverage badge
       if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+      continue-on-error: true
       uses: schneegans/dynamic-badges-action@e9a478b16159b4d31420099ba146cdc50f134483 # v1.7.0
       with:
         auth: ${{ secrets.GIST_SECRET }}