Add image names to compose files which do a local build.

Config/F-DroidRepo/docker-compose.example.yml

@@ -61,6 +61,7 @@ services:
         FILE37: ${FILE37}
         FILE38: ${FILE38}
         FILE39: ${FILE39}
+    image: hyperling/fdroid-server:latest
     restart: always
     ports:
       - "8015:80"