fix: multiline command

Author: PierreJeanjacquot

.github/workflows/sconify.yml

@@ -115,7 +115,7 @@ jobs:
           docker run \
           --rm \
           -v /var/run/docker.sock:/var/run/docker.sock \
-          -v $HOME/sig/enclave-key.pem:/sig/enclave-key.pem
+          -v $HOME/sig/enclave-key.pem:/sig/enclave-key.pem \
           registry.scontain.com/scone-production/iexec-sconify-image:${{ inputs.sconify-version }} \
           sconify_iexec \
           --from=${{ inputs.docker-registry }}/${{ inputs.image-name }}:${{ inputs.image-tag }} \