Remove GitHub Actions cache - not supported by Gitea

Gitea Actions doesn't support type=gha caching, causing timeout errors.
Removing cache config to get builds working. Can add registry-based
caching later if needed.

.github/workflows/deploy.yml

@@ -92,8 +92,6 @@ jobs:
           tags: |
             ${{ secrets.HARBOR_REGISTRY }}/${{ secrets.HARBOR_PROJECT }}/${{ env.IMAGE_NAME }}:${{ steps.set-tag.outputs.tag }}
             ${{ secrets.HARBOR_REGISTRY }}/${{ secrets.HARBOR_PROJECT }}/${{ env.IMAGE_NAME }}:latest
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
 
   # ============================================================
   # Deploy Job - Pull image and restart on production server