snowballtool-base backend stack (#751)

This adds a stack for the backend from snowball/snowballtools-base.

Reviewed-on: cerc-io/stack-orchestrator#751
Co-authored-by: Thomas E Lackey <telackey@bozemanpass.com>
Co-committed-by: Thomas E Lackey <telackey@bozemanpass.com>

stack_orchestrator/data/compose/docker-compose-snowballtools-base-backend.yml

@@ -0,0 +1,13 @@
+services:
+  snowballtools-base-backend:
+    image: cerc/snowballtools-base-backend:local
+    restart: always
+    volumes:
+      - data:/data
+      - config:/config:ro
+    ports:
+      - 8000
+
+volumes:
+  data:
+  config: