Revert "Potential fix for code scanning alert no. 1: Workflow does not contain permissions (#534)"

This reverts commit ef0075b4101570c062d16dfc337870c34d87c7ff.

.github/workflows/ci.yml

@@ -1,7 +1,5 @@
 name: ci
 on: [push, pull_request]
-permissions:
-  contents: read
 
 jobs:
   build: