Fix deployment job

The GitLab CI default image got updated to AlmaLinux 9 and does not
include 'rsync' anymore. Install it within the container.

.gitlab-ci.yml

@@ -36,6 +36,7 @@ deploy:
   before_script:
     - echo ${SERVICE_ACCOUNT_PASSWORD} | base64 -d | kinit -A -f ${SERVICE_ACCOUNT_USERNAME}@CERN.CH
   script:
+    - dnf install -y rsync
     - >
       rsync -av --delete
       -e "ssh -o StrictHostKeyChecking=no -o GSSAPIAuthentication=yes -o GSSAPITrustDNS=yes -o GSSAPIDelegateCredentials=yes"