add: backend preview serve

README.md

@@ -3,7 +3,8 @@
 - python 3.7
 - postgresql 12
 
-# Prepair
+# Prepare
+`mkdir ./previews`
 `docker volume create --name=caddy_data`
 
 # Known restrictions
@@ -11,5 +12,6 @@
 - `SQALCHEMY_DATABASE_URL` in *database.py* and `sqlalchemy.url` in *alembic.ini* **must** be kept in sync
 - martin requires a restart after the very first data is uploaded into an empty database
 `docker-compose --file docker/docker-compose.yml restart martin`
+- *./previews* directory file structure **must** correspond to item *fadr/internal_id*
 
 # Known issues

caddy/Caddyfile

@@ -11,6 +11,11 @@
 
   redir /openapi.json /api/v1/openapi.json permanent
 
+  handle_path /static/previews/* {
+    rewrite * {path}
+    file_server
+  }
+
   root * /usr/share/caddy
   file_server
 }

docker/docker-compose.yml

@@ -36,6 +36,7 @@ services:
       - caddy_data:/data
       - caddy_config:/config
       - ../caddy:/etc/caddy
+      - ../previews:/srv
 
 volumes:
   geodata_db: