Merge pull request #8204 from BacLuc/reduce-context-varnish-image

.docker-hub: make context for varnish smaller

Author: BacLuc

.docker-hub/docker-compose.yml

@@ -24,5 +24,5 @@ services:
   varnish-image:
     image: ${REGISTRY:-docker.io}/${REPO_OWNER:-ecamp}/ecamp3-varnish:${VERSION:-latest}
     build:
-      context: ../
-      dockerfile: .docker-hub/varnish/Dockerfile
+      context: varnish
+      dockerfile: Dockerfile