Use a PAT with no permissions to allow composer to download dependencies (#67)

Author: tomzx

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Install dependencies
       uses: nick-invision/retry@v1
       env:
-          COMPOSER_AUTH: '{"github-oauth":{"github.com":"${{ secrets.GITHUB_TOKEN }}"}}'
+          COMPOSER_AUTH: '{"github-oauth":{"github.com":"${{ secrets.COMPOSER_GITHUB_TOKEN }}"}}'
       with:
           timeout_minutes: 5
           max_attempts: 5