Revert commits that restored default permissions (#107)

Revert "Leave default permissions in build.yml (#105)".
Revert "Persist credentials to fix the deployment process (#104)".

Author: santisoler

.github/workflows/build.yml

@@ -11,13 +11,21 @@ on:
     - cron:  '00 12 * * 1'
   workflow_dispatch:
 
+permissions: {}
+
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          # The GitHub token is preserved by default but this job doesn't need
+          # to be able to push to GitHub.
+          persist-credentials: false
 
       - name: Setup Python
         uses: actions/setup-python@v5