Define $COMPOSE_FILE in config to fix abra app deploy error

By default, the config options provided in the template fail because $COMPOSE_FILE is not set, leading to an error `[abra recipe path] is a directory` when running `abra app deploy`. This is fixed by setting `$COMPOSE_FILE` to `compose.yml`

.env.sample

@@ -3,6 +3,8 @@ TYPE=vaultwarden
 DOMAIN=vaultwarden.example.com
 LETS_ENCRYPT_ENV=production
 
+COMPOSE_FILE="compose.yml"
+
 WEBSOCKET_ENABLED=true
 SIGNUPS_ALLOWED=true
 

compose.yml

@@ -3,7 +3,7 @@ version: "3.8"
 
 services:
   app:
-    image: vaultwarden/server:1.31.0
+    image: vaultwarden/server:1.32.0
     networks:
       - proxy
     environment:
@@ -39,7 +39,7 @@ services:
         - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`)"
         - "traefik.http.routers.${STACK_NAME}.entrypoints=web-secure"
         - "traefik.http.routers.${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
-        - "coop-cloud.${STACK_NAME}.version=0.8.0+1.31.0"
+        - "coop-cloud.${STACK_NAME}.version=0.9.0+1.32.0"
         - "backupbot.backup=true"
         - "backupbot.backup.path=/data"