clean lint workflow

.github/workflows/php-style-lint.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     env:
-      GH_TOKEN: ${{ github.token }}
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
       - name: Setup PHP
@@ -25,11 +25,19 @@ jobs:
         run: echo '${{ secrets.COMPOSER_AUTH_JSON }}' > $GITHUB_WORKSPACE/auth.json
       - name: Install Composer dependencies
         run: composer install
+      - name: Get Pull Request Number
+        id: pr
+        run: echo "::set-output name=pull_request_number::$(gh pr view --json number -q .number || echo "")"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Run PHPCS
         # Get the changed files from the PR via Github CLI.
         # `grep` to only PHP files then remove deleted files via `find`.
         # Run `phpcs` on the remaining files and pass output to `cs2pr`.
         run: |
           echo "Files for this PR:"
-          gh pr diff ${{ github.event.number }} --name-only | grep .php | xargs find 2> /dev/null | cat
-          gh pr diff ${{ github.event.number }} --name-only | grep .php | xargs find 2> /dev/null | xargs vendor/bin/phpcs -nq --report=checkstyle | cs2pr
+          gh pr diff $PR --name-only | grep .php | xargs find 2> /dev/null | cat
+          gh pr diff $PR --name-only | grep .php | xargs find 2> /dev/null | xargs vendor/bin/phpcs -nq --report=checkstyle | cs2pr
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR: ${{ steps.pr.outputs.pull_request_number }}