fix: remove permissions workaround in api container

The permissions in the CI are now the same as in the repository.

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2298>

api/Dockerfile

@@ -94,8 +94,6 @@ RUN apk add --no-cache \
 COPY . /app
 WORKDIR /app
 
-RUN find . -type d -exec chmod 755 {} \+
-
 ENV CACHE_URL="redis://redis:6379/0"
 ENV CELERY_BROKER_URL="redis://redis:6379/0"