fix: use proxy-local.dfinity.network#10424
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A new domain besides
proxy-global.dfinity.networkhas been introduced calledproxy-local.dfinity.networkwhich points to the link localfe80::2IPv6 address. Then in each DC where we have Farm hosts (fr1, dm1, zh1) we have one of the dc_http_proxy nginx servers listen on that link localfe80::2address. Then this commit repoints the URL to download images from fromproxy-global.dfinity.networktoproxy-local.dfinity.network. This will mean that when an IC node downloads an image it will always go to a local dc_http_proxy nginx server instead of hopping over the Atlantic. It could still mean that the local nginx has to hop over the Atlantic to download the image from its source but we avoid the double Atlantic transfers that have been causing flakiness.