[ci] Speed up GH publish skip

[styfle]

This is following a similar pattern to Next.js workflows so that the publish step is skipped and reduces the time it takes GH Actions to run since we don't need to build to know that it should be skipped.

[styfle]

This script is an excerpt from the existing publish script here:

vercel/utils/publish.sh

Lines 18 to 23 in ecb4481

	tag="$(git describe --tags --exact-match 2> /dev/null || :)"
	if [ -z "$tag" ]; then
	echo "Not a tagged commit, skipping publish"
	exit 0
	fi

[codecov]

Codecov Report

Merging #7175 (33abc0e) into main (ecb4481) will not change coverage.
The diff coverage is n/a.

❗ Current head 33abc0e differs from pull request most recent head c44f77c. Consider uploading reports for the commit c44f77c to get more accurate results

@@           Coverage Diff           @@
##             main    #7175   +/-   ##
=======================================
  Coverage   49.17%   49.17%           
=======================================
  Files         135      135           
  Lines        5426     5426           
  Branches     1358     1358           
=======================================
  Hits         2668     2668           
  Misses       2745     2745           
  Partials       13       13           

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