Multiple registryCredentials can't be configured in the DockerExtension - must be configured in ~/.docker/config.json or at each task as a workaround

[tkrah]

This is an enhancement request. At the moment you can configure in the DockerExtension only one credential set:

pluginManager.withPlugin("com.bmuschko.docker-remote-api") {
		docker {
			registryCredentials {
				url = "https://${dockerRegistry}/v2/"
				username = project.property("repository_username")
				password = project.property("repository_password")
			}
		}
	}

My build has some subprojects, those are using different registries to pull from and to push images to. It would be nice if you could configure the credentials for registry URL A and B in the extension and both are used where applicable.

Something like:

pluginManager.withPlugin("com.bmuschko.docker-remote-api") {
		docker {
			registryCredentials {
				url = "https://${dockerRegistry}/v2/"
				username = project.property("repository_username")
				password = project.property("repository_password")
			}
                       registryCredentials {
				url = "https://${AnotherDockerRegistry}/v2/"
				username = project.property("repository_username2")
				password = project.property("repository_password2")
			}
		}
	}

At the moment the only workaround is to either specify on each task who needs another registry the credentials block which is cumbersome to manage because I can't configure it on a central place or to use ´docker login ....´ on the command line because the plugin will fallback to use those credentials - but I would like to remove that workaround and be able to configure both registries (or even more) in the extension block.

[bmuschko]

I would recommend configuring the registry on a per-task level which will override the centrally-configured credentials. Configuration of the credentials through the extension is probably going to be a good chunk of work. I won't have time to work on that now, but feel free to propose a pull request on this.