Support multiple credentials per registry

[bmhughes]

Description

Support multiple credentials per registry

Issues Resolved

List any existing issues this PR resolves

Check List

• A summary of changes made is included in the CHANGELOG under ## Unreleased
• New functionality includes testing.
• New functionality has been documented in the README if applicable.

[github-actions]

Slowest examples

Top 10 slowest examples (2.04 seconds, 29.98% of total time)

Example	Description	Time in seconds
spec/docker_test/container_spec.rb:728	docker_test::container runs execute[change_network_mode]	0.38448
spec/unit/resources/swarm_init_spec.rb:29	docker_swarm_init when initializing a new swarm runs the swarm init command	0.30048
spec/docker_test/container_spec.rb:952	docker_test::container testing GPU support creates a container with GPU support	0.26474
spec/docker_test/installation_package_spec.rb:210	docker_test::installation_package version strings for Ubuntu 20.04 generates the correct version string ubuntu focal	0.2476
spec/docker_test/service_spec.rb:73	docker_test::service creates docker_service[default]	0.15731
spec/docker_test/installation_package_spec.rb:185	docker_test::installation_package Oracle 9: testing default action, default properties is expected to create yum_repository "docker"	0.14732
spec/libraries/container_spec.rb:70	docker_container creates a docker container with default options is expected to create docker_container "hello_world"	0.14494
spec/docker_test/service_spec.rb:162	docker_test::service containerd does not exist creates docker_service[default]	0.14076
spec/libraries/container_spec.rb:353	docker_container creates docker container with cgroupns option is expected to create docker_container "hello_world"	0.13197
spec/unit/resources/swarm_init_spec.rb:25	docker_swarm_init when initializing a new swarm converges successfully	0.12734