chg: Added a better compose file

compose.yaml

@@ -10,9 +10,13 @@ services:
             - 4567:4567
         environment:
             # Change if you want to mount the database somewhere else.
-            # If you do change it, make sure to accordingly change the volume 
-            # mount location below.
-            - db_url=/urls.sqlite
+            # In this case, you can get rid of the db volume below
+            # and instead do a mount manually by specifying the location.
+            # Make sure that you create an empty file with the correct name 
+            # before starting the container if you do make any changes.
+            # (In fact, I'd suggest that you do that so that you can keep
+            # a copy of your database.)
+            - db_url=/db/urls.sqlite
 
             # Change it in case you want to set the website name
             # displayed in front of the shorturls, defaults to
@@ -41,10 +45,8 @@ services:
             # headers instead.
             # - cache_control_header=no-cache, private
         volumes:
-            - ./urls.sqlite:/urls.sqlite
-        networks:
-            - proxy
+            - db:/db
+
+volumes:
+    db:
 
-networks:
-    proxy:
-        external: true