Prefix file path with source/ (#833)

.github/workflows/update-test-rules.yml

@@ -123,7 +123,7 @@ jobs:
           # If multiple PRs modify the same file, only one can be tested. This is solveable, but not something we see often.
           for file in $files_changed; do
             # Skip any LA rules. We'll ignore these downstream anyway, but best to keep the branch clean.
-            la_count=$(grep -c 'beta.linkanalysis' $file || true)
+            la_count=$(grep -c 'beta.linkanalysis' source/$file || true)
             if [[ "$la_count" != '0' ]]; then
               continue
             fi