Using Third-Party Custom Repositories

Use custom repositories from third-party sources.

You can use composer-cli to load custom repositories created by a third-party.

Create the repository source file.
Create a TOML file that references the URL of the custom repository. For example:
```
id = "custom_repo"
name = "Custom Repository"
type = "yum-baseurl"
url = "https://yum.example.com/repos/packages"
check_gpg = false
check_ssl = false
```
The value of the type field must be one of yum-baseurl, yum-mirrorlist, or yum-metalink.
Add the third-party source repository to Image Builder.
Run the following command to add the repository source file:
```
sudo composer-cli sources add filename.toml
```
Check that the new repository is available to Image Builder.
Run the following command to list the available repositories:
```
sudo composer-cli sources list
```