Limit CI checks to tracked files only

Changes the GitHub workflow to use git ls-files to only check tracked
files during formatting, linting, and type checking. This prevents
untracked or ignored files from causing CI failures.

.github/workflows/publish.yml

···
 
       - name: Verify code quality
         run: |
-          deno fmt --check
-          deno lint
-          deno check **/*.ts
+          git ls-files '*.ts' '*.js' '*.tsx' '*.jsx' | xargs -r deno fmt --check
+          git ls-files '*.ts' '*.js' '*.tsx' '*.jsx' | xargs -r deno lint
+          git ls-files '*.ts' | xargs -r deno check
 
       - name: Run tests
         run: deno test --allow-all