config: Define proxy providing function in config #112
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Defining a compose app proxy as a function in the configuration provides the compose app API clients to define runtime logic for obtaining URL and/or CA cert of the proxy server.
In particular, a client does not need to know which of the API functions makes a call to a container registry, hence it does not need to set the proxy before invoking each such the API call. Instead composeapp invokes a client provided function/callback to provide the proxy URL and CA whenever a random API function of composeapp needs it.