fix(ci): update image existence check to use GitHub token for authentication

.github/workflows/native-image.yml

@@ -66,10 +66,19 @@ jobs:
 
       - name: Check if image exists in GHCR
         id: image-check
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
+          # Exchange the GitHub token for a GHCR registry JWT
+          TOKEN=$(curl -s \
+            -u "${{ github.actor }}:${GH_TOKEN}" \
+            "https://ghcr.io/token?scope=repository:now-chess/now-chess-systems/${{ matrix.module }}:pull&service=ghcr.io" \
+            | jq -r .token)
+
           STATUS=$(curl -s -o /dev/null -w "%{http_code}" \
-            -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Authorization: Bearer ${TOKEN}" \
             "https://ghcr.io/v2/now-chess/now-chess-systems/${{ matrix.module }}/manifests/${{ steps.version.outputs.version }}")
+
           if [[ "$STATUS" == "200" ]]; then
             echo "exists=true" >> "$GITHUB_OUTPUT"
           else