Add --config-file option from cli to action

[e-compton-bb]

Hello!

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Issue details

We use Pulumi config files to set various parameters for our stacks, but our config files have different names to the stacks. Because of this it's not possible to use the github action to deploy as there's no way to specify a config-file with a different name to the stack that you're deploying.

Affected area/feature

[justinvp]

Thanks for the suggestion.