Are MINIO environment variables required to run the Flask app?

[manics]

The docker-compose service for the flask app has several MINIO_*configuration variables, including credentials:

RO-Crate-Validation-Service/docker-compose.yml

Lines 14 to 17 in 422a4f7

	- MINIO_ENDPOINT=${MINIO_ENDPOINT}
	- MINIO_ROOT_USER=${MINIO_ROOT_USER}
	- MINIO_ROOT_PASSWORD=${MINIO_ROOT_PASSWORD}
	- MINIO_BUCKET_NAME=${MINIO_BUCKET_NAME}

However the documented API calls that connect to the object store require passing the minio config as a parameter

RO-Crate-Validation-Service/README.md

Lines 5 to 118 in 422a4f7

	## API
	#### Request Validation of RO-Crate
	<details>
	<summary><code>POST</code> <code><b>v1/ro_crates/{crate_id}/validation</b></code> <code>(Request validation of RO-Crate validation in Object Store)</code></summary>
	##### Path Parameters
	| name | type | data type | description |
	|------------|-----------|-------------------------|-----------------------------------------------------------------------|
	| crate_id | required | string | RO-Crate identifer string |
	##### Parameters
	| name | type | data type | description |
	|------------|-----------|-------------------------|-----------------------------------------------------------------------|
	| root_path | optional | string | Root path which contains the RO-Crate |
	| webhook_url | optional | string | Webhook to send validation result to |
	| profile_name | optional | string | RO-Crate profile to validate against |
	| minio_config | required | dictionary | MinIO Configuration Details |
	`minio_config`
	> | name | type | data type | description |
	> |------------|-----------|-------------------------|-----------------------------------------------------------------------|
	> | endpoint | required | string | MinIO endpoint |
	> | accesskey | required | string | MinIO access key or username |
	> | secret | required | string | MinIO secret or password |
	> | ssl | required | boolean | Use SSL encryption for MinIO access? |
	> | bucket | required | string | MinIO bucket containing RO-Crate |
	##### Responses
	| http code | content-type | response |
	|---------------|-----------------------------------|---------------------------------------------------------------------|
	| `202` | `application/json` | `{"message": "Validation in progress"}` |
	| `400` | `application/json` | `{"message": "No RO-Crate with prefix: <crate_id>"}` |
	| `500` | `application/json` | `{"message": "Internal server errors"}` |
	```javascript
	curl -X 'POST' \
	'http://localhost:5001/v1/ro_crates/<crate_id>/validation' \
	-H 'accept: application/json' \
	-H 'Content-Type: application/json' \
	-d '{
	"minio_config": {
	"accesskey": "<key>",
	"bucket": "ro-crates",
	"endpoint": "minio:9000",
	"secret": "<secret>",
	"ssl": false
	},
	"profile_name": "<profile>",
	"webhook_url": "<webhook>"
	}'
	```
	</details>
	#### Get RO-Crate Validation Result
	<details>
	<summary><code>GET</code> <code><b>v1/ro_crates/{crate_id}/validation</b></code> <code>(Obtain RO-Crate validation result from Object Store)</code></summary>
	##### Path Parameters
	| name | type | data type | description |
	|------------|-----------|-------------------------|-----------------------------------------------------------------------|
	| crate_id | required | string | RO-Crate identifer string |
	##### Parameters
	| name | type | data type | description |
	|------------|-----------|-------------------------|-----------------------------------------------------------------------|
	| root_path | optional | string | Root path which contains the RO-Crate |
	| minio_config | required | dictionary | MinIO Configuration Details |
	`minio_config`
	> | name | type | data type | description |
	> |------------|-----------|-------------------------|-----------------------------------------------------------------------|
	> | endpoint | required | string | MinIO endpoint |
	> | accesskey | required | string | MinIO access key or username |
	> | secret | required | string | MinIO secret or password |
	> | ssl | required | boolean | Use SSL encryption for MinIO access? |
	> | bucket | required | string | MinIO bucket containing RO-Crate |
	##### Responses
	| http code | content-type | response |
	|---------------|-----------------------------------|---------------------------------------------------------------------|
	| `200` | `application/json` | `Successful Validation` |
	| `422` | `application/json` | `Error: Details of Validation Error` |
	| `404` | `application/json` | `Not found` |
	##### Example cURL
	```javascript
	curl -X 'GET' \
	'http://localhost:5001/v1/ro_crates/<crate_id>/validation' \
	-H 'accept: application/json' \
	-H 'Content-Type: application/json' \
	-d '{
	"minio_config": {
	"accesskey": "<key>",
	"bucket": "ro-crates",
	"endpoint": "minio:9000",
	"secret": "<secret>",
	"ssl": false
	}
	}'
	```
	</details>

What are the Flask MINIO_* environment variables used for?