fix specs, add migrator

.devcontainer/docker-compose.yml

@@ -10,6 +10,8 @@ services:
       - ../..:/workspaces:cached
       - ./fish-shell-conf-d:/home/vscode/.config/fish/conf.d
       - devcontainer-redux-gem-cache:/usr/local/rvm/gems
+      - devcontainer-redux-blob-files:/mnt/blob_files_development
+      - /tank/redux-data/blob_files_production:/mnt/blob_files_production
 
     # Overrides default command so things don't shut down after the process ends.
     command: sleep infinity
@@ -44,3 +46,4 @@ services:
 volumes:
   postgres-data:
   devcontainer-redux-gem-cache:
+  devcontainer-redux-blob-files: