add test for uploading file

[dlamoris]

try using minio testcontainers https://testcontainers.com/modules/minio/ to spin up a minio container to test with

ktor test example
https://ktor.io/docs/testing.html#test-post-put

the docker-compose file here https://github.com/Open-MBEE/flexo-mms-deployment/tree/develop/docker-compose has an example of the parameters to configure for minio and store service

the api to test is https://github.com/Open-MBEE/flexo-mms-store-service/blob/develop/src/main/kotlin/org/openmbee/flexo/mms/plugins/Storage.kt#L39