Fix last broken test

Author: Link-

.github/workflows/test.yml

@@ -74,7 +74,8 @@ jobs:
 
       - name: Generate then revoke token
         run: |
-          token="$(./gh-token generate -i $APP_ID -b $APP_PRIVATE_KEY)"
+          echo "$APP_PRIVATE_KEY" > private_key.pem
+          token="$(./gh-token generate -i $APP_ID -k private_key.pem)"
           ./gh-token revoke -t $token
         env:
           APP_ID: ${{ secrets.APP_ID }}