Platform Requirements for 17.x

[AshCripps]

Its that time of year again

What we build and test on

From https://github.com/nodejs/node/blob/master/BUILDING.md#official-binary-platforms-and-toolchains

Binary package	Platform and Toolchain
aix-ppc64	AIX 7.2 TL04 on PPC64BE with GCC 8
darwin-x64	macOS 10.15, Xcode Command Line Tools 11 with -mmacosx-version-min=10.13
darwin-arm64 (and .pkg)	macOS 11 (arm64), Xcode Command Line Tools 12 with -mmacosx-version-min=10.13
linux-arm64	CentOS 7 with devtoolset-8 / GCC 8 8
linux-armv7l	Cross-compiled on Ubuntu 18.04 x64 with custom GCC toolchain
linux-ppc64le	CentOS 7 with devtoolset-8 / GCC 8 8
linux-s390x	RHEL 7 with devtoolset-8 / GCC 8 8
linux-x64	CentOS 7 with devtoolset-8 / GCC 8 8
win-x64 and win-x86	Windows 2012 R2 (x64) with Visual Studio 2019

Compiler levels

Operating System	Compiler Versions
Linux	GCC >= 8.3
Windows	Visual Studio >= 2019 with the Windows 10 SDK on a 64-bit host
macOS	Xcode >= 11 (Apple LLVM >= 11)

Actions

• Add some Big Sur intel based macs

I dont think theres much to do this time around? cc @nodejs/build

[nschonni]

Does it make sense to raise Alpine/musl from Experimental to Tier 2 for the new release line?