chore: Check for readme changes in each PR

[sspaink]

resolve: #11303

Fail the CI if there are changes after running make docs so that the originally PR author knows to run make docs.
Currently the CI is expected to fail until this is merged: #11489
You can see the error message here: https://app.circleci.com/pipelines/github/influxdata/telegraf/11612/workflows/97cd696d-8cf6-4756-a127-5611fb25af79/jobs/189853

[powersj]

Thanks! This looks pretty straight forward.

After thinking about this post-meeting, I did want to ask, is this what we want? We do not ask users to update the config in the etc/* directory. If so, I do think we should have a checklist for contributors beyond "make CI happy," but of commands, they should run before pushing to CI that need to pass. Thoughts?

[sspaink]

@powersj good point, making it as easy for the contributor as possible is important. I updated the pull request template and the contribution doc to mention running make docs. What do you think about that? Any other places we should mention it? I do think asking the contributor to run it shouldn't be too big of an ask, it is less work then updating the etc configs.

[powersj]

Perfect I think this eases my concerns!

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_amd64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

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

📦 Click here to get additional PR build artifacts

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	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_riscv64.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

[sspaink]

The out of sync README.md have been updated in a separate PR, so now the CI passes: https://app.circleci.com/pipelines/github/influxdata/telegraf/11617/workflows/8870f983-a288-460c-8c30-72e777f123b5/jobs/189902?invite=true#step-104-8