Enteprise readiness - Support for HTTP_PROXY / HTTPS_PROXY / NO_PROXY or explicit proxy flag for the push command

[lucabelluccini]

Support for HTTP_PROXY / HTTPS_PROXY / NO_PROXY or explicit proxy flag for the push command would be a great addition.

[peterhoogendijk]

The undici http client module being used for the push command provides a ProxyAgent class that can be easily implemented in the elastic/synthetics code. It also provides a still experimental EnvHttpProxyAgent class that could be used for global proxy support, so not only for push, once it is not experimental anymore. I currently do not yet need proxy support but I might need it in the future ...