FWIW, if you wanted to get the static from-scratch go image a lot smaller, try running the binary through UPX. It typically improves compiled go binary sizes by absurd amounts: https://upx.github.io/
Also, https://busybox.net is a 1.0MB static binary that provides all of the standard posix-compliant tools (sh, grep, tail, etc) and actually comes with an httpd implementation. So if you wanted a more useful container at about 1MB, you could use it.
Edit: here's a previous thread on UPX that has 80 comments talking about the tradeoffs it makes. You should definitely consider these if you intend to use UPX: https://news.ycombinator.com/item?id=15456980
Also, https://busybox.net is a 1.0MB static binary that provides all of the standard posix-compliant tools (sh, grep, tail, etc) and actually comes with an httpd implementation. So if you wanted a more useful container at about 1MB, you could use it.
Edit: here's a previous thread on UPX that has 80 comments talking about the tradeoffs it makes. You should definitely consider these if you intend to use UPX: https://news.ycombinator.com/item?id=15456980