testing/httpx: use make instead of go commands

I originally wanted to avoid using make, but later realised it's already in build-base which gets installed by default on the runners.

I think it's up to you, but sure, seems like it also shaves off a few megabytes of the package

added 52 commits

• 2032ecbd...d29a41ab - 51 commits from branch alpine:master
• 3d875143 - testing/httpx: use make instead of go commands

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merged