Reorders steps in GitHub Actions workflow to ensure environment variables are prepared before checking out the repository

.github/workflows/build-deb.yml

@@ -8,14 +8,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: 🛒 Checkout Repository
-        uses: actions/checkout@v4
-
       - name: ⚙️ Prepare Environment Variables
         run: |
           echo "AGENT_TOOLSDIRECTORY=/home/runner/toolcache" >> $GITHUB_ENV
           mkdir -p /home/runner/toolcache
 
+      - name: 🛒 Checkout Repository
+        uses: actions/checkout@v4
+
       - name: 🐍 Setup Python
         uses: actions/setup-python@v5
         with: