Route registry push via internal network to bypass Cloudflare

act_runner and Gitea run on the same host (alu/192.168.86.31),
so we override DNS in the runner to push directly over LAN.
This avoids Cloudflare's upload size limit (413 on 7.79GB image).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -16,6 +16,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Route registry traffic via internal network
+        run: echo "192.168.86.31 gitea.theriise.net" | sudo tee -a /etc/hosts
+
       - name: Log in to Gitea Container Registry
         uses: docker/login-action@v3
         with: