Use S3 as static and media storage

TODO

- [ ] Write some documentation for non-AWS, S3-compatible services
- [ ] Make a management command to move existing media to the new S3 bucket
- [ ] See if Nginx can reverse-proxy the S3 bucket in order to keep the files accessible through the domain name

.env.prod.example

@@ -50,3 +50,13 @@ EMAIL_USE_SSL=false
 
 # Set this to true when initializing certbot for domain, false when not
 CERTBOT_INIT=false
+
+# S3 configuration
+# Commented are example values if you use Scaleway instead of AWS
+USE_S3=false
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+# AWS_STORAGE_BUCKET_NAME=        # "example-bucket-name"
+# AWS_S3_CUSTOM_DOMAIN=None       # "example-bucket-name.s3.fr-par.scw.cloud"
+# AWS_S3_REGION_NAME=None         # "fr-par"
+# AWS_S3_ENDPOINT_URL=None        # "https://s3.fr-par.scw.cloud"