Post MVP - Day 1: get-tce-release.sh script for public repo

[jpmcb]

What this PR does / why we need it

Modifies the docs and the get-tce-release script to work for a public repo

Details for the Release Notes (PLEASE PROVIDE)

get-tce-release script works for the community edition public repo

Which issue(s) this PR fixes

Follow up to #1855 as we get the auth ready for public release
Follow up to #1442 in order to remove the unnecessary auth steps in the script

Describe testing done for PR

Changed this line:

GH_REPO="$GH_API/repos/vmware-tanzu/community-edition"

to be

GH_REPO="$GH_API/repos/BurntSushi/ripgrep"

and verified the script works to download an asset without the GITHUB_TOKEN env variable for a public repo:

# unset my current token in the env
❯ unset GITHUB_TOKEN

# Use the tweeked script to test downloading an asset without a github access token
❯ hack/get-tce-release.sh 13.0.0 ripgrep-13.0.0-x86_64-unknown-linux-musl
Validating dependencies ...
curl is /usr/bin/curl
grep is /usr/bin/grep
sed is /usr/bin/sed
tr is /usr/bin/tr
jq is /usr/bin/jq
Warning: No GITHUB_TOKEN variable defined - requests to the GitHub API may be rate limited
Downloading asset ...
################################################################################# 100.0%

# eagle landed successfully
❯ ls -la 
...
-rw-rw-r--  1 jmcb jmcb 2.1M Sep 23 08:54 ripgrep-13.0.0-x86_64-unknown-linux-musl.tar.gz

We should merge once the repo is public and then verify at that time as well

Special notes for your reviewer

N/a

[jpmcb]

Ready to merge - but would still be good to test this PR after the repo is made public and tweak any hiccups