fix

.github/workflows/integration.yml

@@ -63,6 +63,7 @@ jobs:
               curl --fail -X POST -n -N -F zip=@${i}.zip http://localhost/domjudge/api/contests/demo/problems
           done
       - name: Preparing curl cookiejar
+        shell: bash
         run: |
           export CURLOPTS="--fail -sq -m 30 -b /tmp/cookiejar"
           # Make an initial request which will get us a session id, and grab the csrf token from it