docker_push: allow passing cred_helpers from toolchain into commands #2257
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When an environment sets up the credentials helpers and configuration it's expected the behaviour that container_pull provides is also offered by container_push
PR Checklist
Please check if your PR fulfills the following requirements:
There are no tests for container_push, didn't explore adding those, in terms of docs the documented behaviour is not what's happening, after this PR docs and behaviour matches.
PR Type
What kind of change does this PR introduce?
What is the current behavior?
Workspace configures toolchain with both client_config and cred_helpers but yet the container_push is not authenticated, unless the helpers are in the host $PATH, leading to non reproducible setups.
Issue Number: 2126
What is the new behavior?
Workspace configures toolchain with both client_config and cred_helpers but now the provided cred_helpers are used for authentication not relying on host setup.
Does this PR introduce a breaking change?
Other information
Using it internally at booking.com already