Add rabbitmq docker image

offline_deployment/offline_01_2-patch_and_extract_Docker_images.sh

@@ -37,3 +37,4 @@ docker-compose -f ../docker-compose.prod.yml build
 docker image save -o doccano-backend.tar doccano-backend:custom
 docker image save -o doccano-nginx.tar   doccano-nginx:custom
 docker image save -o postgres.tar        postgres:13.1-alpine
+docker image save -o rabbitmq.tar        rabbitmq:3.8

offline_deployment/offline_02_2-import_Docker_images.sh

@@ -12,3 +12,4 @@ sed -i 's^dockerfile: nginx/Dockerfile^dockerfile: nginx/Dockerfile\n    image:
 docker image load -i doccano-backend.tar
 docker image load -i doccano-nginx.tar
 docker image load -i postgres.tar
+docker image load -i rabbitmq.tar