Override entrypoint of minio to make 'rust-docs-rs' bucket #463

docs.rs expects there to be a bucket 'rust-docs-rs', the minio Docker
image does not provide a nice way to launch with a default bucket.

As a workaround, we have to override the entrypoint to do some work
before starting the minio server. When the minio server is launched
with a directory that is not empty, it will interpret the directories
present as buckets it needs to create. So by adding an empty directory
'rust-docs-rs', we can trick minio in creating a similarly named
bucket.

This solution is a mixture of the following comments:
 - minio/minio#4769 (comment)
 - minio/minio#4769 (comment)

Author: Koenraad Verheyden

docker-compose.yml

@@ -28,7 +28,11 @@ services:
             POSTGRES_PASSWORD: password
     s3:
         image: minio/minio
-        command: server /data
+        entrypoint: >
+            /bin/sh -c "
+                mkdir /data/rust-docs-rs;
+                minio server /data;
+            "
         ports:
             - "9000:9000"
         volumes: