ci(deploy): push builds to attic binary cache (attic.asepharyana.my.id)

.github/workflows/deploy.yml

@@ -107,13 +107,39 @@ jobs:
           ssh-keygen -y -f ~/.ssh/id_ed25519 >/dev/null 2>&1 || { echo "SSH key invalid"; exit 1; }
           ssh-keyscan -H "$VPS_HOST" >> ~/.ssh/known_hosts 2>/dev/null
 
+      # Push build result to Attic binary cache (attic.asepharyana.my.id) so
+      # the VPS can substitute it instead of a single-stream `nix copy ssh://`.
+      # The attic client runs on the VPS (pre-built at
+      # /nix/store/fygyy3yk4rqdknxkiwkqambpnhyax0k4-attic-0.1.0, config in
+      # /root/.config/attic with server "imrnes-ts" → Tailscale 100.121.180.82).
+      - name: Push to Attic cache
+        env:
+          ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
+        run: |
+          if [ -z "$ATTIC_TOKEN" ]; then
+            echo "ATTIC_TOKEN not set; skipping attic push"
+            exit 0
+          fi
+          STORE_PATH="${{ steps.build.outputs.store-path }}"
+          # Copy closure to VPS (fast if attic already has it via substitute)
+          ssh "$VPS_USER@$VPS_HOST" "sudo /nix/var/nix/profiles/default/bin/nix-store --realise '$STORE_PATH'" 2>/dev/null \
+            || nix copy --to "ssh://$VPS_USER@$VPS_HOST" "$STORE_PATH"
+          # Push from VPS → Attic over Tailscale (reliable for large payloads)
+          ssh "$VPS_USER@$VPS_HOST" "/nix/store/fygyy3yk4rqdknxkiwkqambpnhyax0k4-attic-0.1.0/bin/attic push imrnes-ts:gmw '$STORE_PATH' --jobs 4" \
+            || echo "attic push failed (non-fatal; ssh copy fallback below)"
+
       # NOTE: env files /etc/gmw/backend.env & /etc/gmw/discord-gateway.env are
       # managed MANUALLY on the VPS (source of truth). CI only builds & deploys.
       - name: Deploy ${{ matrix.service }} to VPS
         run: |
           STORE_PATH="${{ steps.build.outputs.store-path }}"
           echo "=== Copying ${{ matrix.service }}: $STORE_PATH ==="
+          if [ -n "${{ secrets.ATTIC_TOKEN }}" ] && ssh "$VPS_USER@$VPS_HOST" "sudo /nix/var/nix/profiles/default/bin/nix-store --realise '$STORE_PATH'" 2>/dev/null; then
+            echo "Substituted ${{ matrix.service }} from Attic cache"
+          else
+            echo "Attic substitute failed; falling back to ssh copy"
             nix copy --to "ssh://$VPS_USER@$VPS_HOST" "$STORE_PATH"
+          fi
 
           echo "=== Updating profile ==="
           ssh "$VPS_USER@$VPS_HOST" "sudo /nix/var/nix/profiles/default/bin/nix-env --profile /nix/var/nix/profiles/gmw-${{ matrix.service }} --set '$STORE_PATH'"