Run all tests for .github/workflows

Files directly in .github/* are not related to code execution changes, but files in .github/workflows/* are. 

Prevents full test execution on changes to CODEOWNERS

Author: glasnt

build/int.cloudbuild.yaml

@@ -36,7 +36,7 @@ steps:
 
       # Do not prune if changing tests themselves
       while read d; do
-        if [[ "build test .github" =~ "${d%/}" ]]; then
+        if [[ "build test .github/workflows" =~ "${d%/}" ]]; then
           echo "Infrastructure folder ${d%/} has changed; no tests will be pruned."
           exit 0 # do not prune
         fi