
Ensure `spack mirror add <name> <url/path>` without further arguments translates to `<name>: <url>` key value pairs in mirrors.yaml. If --s3-* flags are provided, only store the provided ones. Co-authored-by: Harmen Stoppels <me@harmenstoppels.nl>
Ensure `spack mirror add <name> <url/path>` without further arguments translates to `<name>: <url>` key value pairs in mirrors.yaml. If --s3-* flags are provided, only store the provided ones. Co-authored-by: Harmen Stoppels <me@harmenstoppels.nl>