chore: update macOS workflow to use APPLE_API_KEY_BASE64 for improved key handling and environment configuration

Author: ChxGuillaume

.github/workflows/build-mac.yml

@@ -19,7 +19,7 @@ jobs:
     env:
       APPLE_API_ISSUER: ${{ secrets.APPLE_API_ISSUER }}
       APPLE_API_KEY_ID: ${{ secrets.APPLE_API_KEY_ID }}
-      APPLE_API_KEY: ${{ secrets.APPLE_API_KEY }}
+      APPLE_API_KEY_BASE64: ${{ secrets.APPLE_API_KEY }}
       CSC_KEY_PASSWORD: ${{ secrets.APPLE_CERTIFICATES_BUNDLE_PASSWORD }}
     steps:
       - name: Checkout repository
@@ -70,7 +70,11 @@ jobs:
       - name: Install Apple API key
         run: |
           mkdir -p ~/private_keys/
-          echo -n "$APPLE_API_KEY" | base64 --decode > ~/private_keys/AuthKey_$APPLE_API_KEY_ID.p8
+
+          KEY_PATH=~/private_keys/AuthKey_$APPLE_API_KEY_ID.p8
+
+          echo -n "$APPLE_API_KEY_BASE64" | base64 --decode -o $KEY_PATH
+          echo "APPLE_API_KEY=$KEY_PATH" >> $GITHUB_ENV
 
       - name: Install Mac Profiles
         env: