Avoid repeat anchors for images

See https://git.autonomic.zone/coop-cloud/abra/issues/172.

compose.yml

@@ -47,7 +47,7 @@ x-secrets: &secrets
   - smtp_password
 services:
   app:
-    image: &image foodcoops/foodsoft:4.7.1
+    image: foodcoops/foodsoft:4.7.1
     networks:
       - internal
       - proxy
@@ -75,7 +75,7 @@ services:
         - "traefik.http.routers.foodsoft.tls.certresolver=${LETS_ENCRYPT_ENV}"
         - coop-cloud.${STACK_NAME}.app.version=4.7.1-99afb9a3
   cron:
-    image: *image
+    image: foodcoops/foodsoft:4.7.1
     environment:
       !!merge <<: *env
       FOODSOFT_SERVICE: cron
@@ -87,7 +87,7 @@ services:
     deploy:
       labels: ['coop-cloud.${STACK_NAME}.cron.version=*image-']
   worker:
-    image: *image
+    image: foodcoops/foodsoft:4.7.1
     environment:
       !!merge <<: *env
       FOODSOFT_SERVICE: worker
@@ -99,7 +99,7 @@ services:
     deploy:
       labels: ['coop-cloud.${STACK_NAME}.worker.version=*image-']
   smtp:
-    image: *image
+    image: foodcoops/foodsoft:4.7.1
     configs: *configs
     entrypoint: *entrypoint
     secrets: *secrets