Name the volume with existing variables

This reverts commit b15883c239.

Signed-off-by: Benoit Donneaux <benoit@leastauthority.com>

.gitea/workflows/jekyll.yaml

@@ -41,7 +41,7 @@ jobs:
       - name: Verify Jekyll container
         id: verify_image
         run: |
-          VOL=$(docker volume ls | grep -Po "GITEA-ACTIONS-TASK-[0-9]+_WORKFLOW-Jekyll_JOB-test-ci-actions$")
+          VOL="${JOB_CONTAINER_NAME}"
           docker-compose run --rm --entrypoint bash -v "${VOL}:/home/ubuntu/workspace" jekyll -c "whoami; pwd; ls -lA ."
       - name: Build Jekyll site
         id: build_site