fix: pgAdmin storage permissions and siren stationtype NOT NULL

- pgAdmin: use named volume for /var/lib/pgadmin instead of bind mount
  subdirectory (fixes permission denied on storage dir)
- Siren INSERT in sidesdecode.py: add stationtype=3 to both INSERT
  statements (fixes NOT NULL constraint violation)

docker-compose.yml

@@ -63,7 +63,8 @@ services:
       - PGADMIN_DEFAULT_EMAIL=${PGADMIN_EMAIL}
       - PGADMIN_DEFAULT_PASSWORD=${PGADMIN_PASSWORD}
     volumes:
-      - ./backup:/var/lib/pgadmin/storage/tck68000_gmail.com/backup:z
+      - pgadmin_data:/var/lib/pgadmin
+      - ./backup:/backups
     ports:
       - "5050:80"
     depends_on:
@@ -87,3 +88,4 @@ services:
 
 volumes:
   pgdata:
+  pgadmin_data: