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Troubleshooting
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I am back with THE SOLUTION (for me, anyway):

I needed to add the proxy to a variable called MM_SERVICESETTINGS_ALLOWEDUNTRUSTEDINTERNALCONNECTIONS in the environment:

mattermost['env'] = {"http_proxy" => "http://proxy.company.com:80", 
"https_proxy" => "http://proxy.company.com:80", 
"no_proxy" => "localhost,127.0.0.1,.company.com"
"MM_SERVICESETTINGS_ALLOWEDUNTRUSTEDINTERNALCONNECTIONS" => "localhost 127.0.0.1 proxy.company.com"}

If you just run Mattermost without Gitlab, the equivalent variable is AllowedUntrustedInternalConnections in config.json. If you are using the bundled version you CANNOT use that config file - Gitlab will override it with the environment variable always, because it makes sure it includes at least localhost.

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