Use repository root as build context in docker-compose

This fixes the issue where `docker-compose` fails to build takahe:latest container. The cause of issue is the build context for docker compose is different from the one of `docker build`. Currently, `make image` uses the repository root as a build context while `make compose_up` will use `docker/` directory as a build context. That's why docker-compose couldn't find the required files during building.

docker/docker-compose.yml

@@ -6,7 +6,10 @@ version: "3.4"
 
 x-takahe-common:
   &takahe-common
-    build: .
+    build:
+      context: ..
+      dockerfile: ./docker/Dockerfile
+
     image: takahe:latest
     environment:
       DJANGO_SETTINGS_MODULE: takahe.settings.development