fix: mac signing issue with arm64

[sspaink]

The arm64 binary failed to get signed during the release because by default Go gives an ad hoc signature to arm64 binaries because Mac requires a signed binary with arm64 otherwise all Go binaries will fail (thread about this here: golang/go#42684). Therefore in order to overwrite the ad hoc sig with our influxdata signature we needed to provide the flag --force to the codesign tool. This pull requests adds the required --force flag and refactored the mac signing shell script. All linter issues found by shellcheck were addressed, more information is printed out for future debugging, and I updated the script to stop changing directories and instead use absolute paths to make it easier to read.

This was tested by changing the circleci config to only build and sign the mac artifacts, you can see the results here:

• https://app.circleci.com/pipelines/github/influxdata/telegraf/8166/workflows/f51a71e7-3a9d-4311-b3a0-6c4e9df4071e

you can find the artifacts that include the signed dmg files here:

• https://app.circleci.com/pipelines/github/influxdata/telegraf/8166/workflows/f51a71e7-3a9d-4311-b3a0-6c4e9df4071e/jobs/138696/artifacts

[MyaLongmire]

Thank you so much for figuring this out!

[powersj]

Awesome work and a big thank you for the clean-up. This should make this easier in the future if we ever need to debug any issues! Two small changes, otherwise this is good to go.

[telegraf-tiger]

👍 This pull request doesn't change the Telegraf binary size

📦 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	darwin_arm64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	s390x.rpm	linux_amd64.tar.gz
mipsel.deb	x86_64.rpm	linux_arm64.tar.gz
ppc64el.deb		linux_armel.tar.gz
s390x.deb		linux_armhf.tar.gz
		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