fix: Allow for non x86 macs in Go install script

[popey]

New macs have arm64 processors. This PR simply modifies the helper script to install the correct architecture build of go on an arm64 (so-called M1/M1 Max/M1 Pro) Apple computer.

Required for all PRs:

• Updated associated README.md.
• Wrote appropriate unit tests.
• Pull request title or commits are in conventional commit format

Resolves #9981

This simply detects the architecture of the machine the script is running on with uname -m - which outputs either arm64 or x86_64 for M1 or Intel Macs respectively. It then uses the right filename and checksum for the relevant architecture.

I also added some mkdir commands because the script assumed /usr/local/Cellar and /usr/local/bin exists, when on a clean Mac, they don't.

Tested on my daughter's M1 mac ;).

alan@Sophies-MacBook-Air telegraf % ./scripts/installgo_mac.sh   
++ uname -m
+ ARCH=arm64
+ GO_VERSION=1.17.2
+ '[' arm64 = arm64 ']'
+ GO_ARCH=darwin-arm64
+ GO_VERSION_SHA=ce8771bd3edfb5b28104084b56bbb532eeb47fbb7769c3e664c6223712c30904
+ path=/usr/local/Cellar
+ sudo mkdir -p /usr/local/Cellar
+ command -v go
+ setup_go
+ echo 'installing go'
installing go
+ curl -L https://golang.org/dl/go1.17.2.darwin-arm64.tar.gz --output go1.17.2.darwin-arm64.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    76  100    76    0     0    337      0 --:--:-- --:--:-- --:--:--   336
100  123M  100  123M    0     0  3351k      0  0:00:37  0:00:37 --:--:-- 3737k
+ echo 'ce8771bd3edfb5b28104084b56bbb532eeb47fbb7769c3e664c6223712c30904  go1.17.2.darwin-arm64.tar.gz'
+ shasum --algorithm 256 --check -
go1.17.2.darwin-arm64.tar.gz: OK
+ sudo rm -rf /usr/local/Cellar/go
+ sudo tar -C /usr/local/Cellar -xzf go1.17.2.darwin-arm64.tar.gz
+ sudo mkdir -p /usr/local/bin
+ sudo ln -sf /usr/local/Cellar/go/bin/go /usr/local/bin/go
+ sudo ln -sf /usr/local/Cellar/go/bin/gofmt /usr/local/bin/gofmt

Also tested use case where it's already installed

alan@Sophies-MacBook-Air telegraf % ./scripts/installgo_mac.sh
++ uname -m
+ ARCH=arm64
+ GO_VERSION=1.17.2
+ '[' arm64 = arm64 ']'
+ GO_ARCH=darwin-arm64
+ GO_VERSION_SHA=ce8771bd3edfb5b28104084b56bbb532eeb47fbb7769c3e664c6223712c30904
+ path=/usr/local/Cellar
+ sudo mkdir -p /usr/local/Cellar
+ command -v go
+ echo 'Go is already installed'
Go is already installed
++ go version
++ read -r _ _ v _
++ echo 1.17.2
+ v=1.17.2
+ echo '1.17.2 is installed, required version is 1.17.2'
1.17.2 is installed, required version is 1.17.2
+ '[' 1.17.2 '!=' 1.17.2 ']'

Note: Not tested on a "legacy" x86 Mac.

[telegraf-tiger]

⚠️ This pull request increases the Telegraf binary size by 3.83 % for linux amd64 (new size: 132.1 MB, nightly size 127.2 MB)

📦 Looks like new artifacts were built from this PR.

Expand this list to get them here! 🐯

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_armv7.tar.gz
armhf.deb	i386.rpm	freebsd_i386.tar.gz
i386.deb	ppc64le.rpm	linux_amd64.tar.gz
mips.deb	s390x.rpm	linux_arm64.tar.gz
mipsel.deb	x86_64.rpm	linux_armel.tar.gz
ppc64el.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz